Discussion
Home ‣ Aptitude ‣ Boats and Streams See What Others Are Saying!
- Question
- A river is flowing at a speed of 5 km/h in a particular direction. A man, who can swim at a speed of 20 km/h in still water, starts swimming along the direction of flow of the river from from points A and reaches another point B which is at a distance of 30 km from the starting point A. On reaching point B, the man turns back and starts swimming against the direction of flow of the river and stops after reaching point A. The total time taken by the man to complete his journey is?
Options- A. 2 h 30 min
- B. 3 h 12 min
- C. 3 h 30 min
- D. 3 h 45 min
- Correct Answer
- 3 h 12 min
ExplanationGiven,
Speed of the stream = 5 km/h
and speed of the man in still water = 20 km/h
? Speed of the man downstream = 20 + 5 = 25 km/h
and speed of the man upstream = 20 - 5 = 15 km/h
? Total time taken to complete the whole journey = 30/25 + 30/15
= (30 x 8) / 75
= 3 h 12 min - 1. A father said to his son, "I was as old as you are at the present at the time of your birth". If the father's age is 38 years now, the son's age five years back was:
Options- A. 14 years
- B. 19 years
- C. 33 years
- D. 38 years Discuss
- 2. A tree increases annually by 1/8 th of its height. By how much will it increase after 2 years, if it stands today 64 cm high?
Options- A. 72 cm
- B. 74 cm
- C. 75 cm
- D. 81 cm Discuss
- 3. Vandana invested an amount of ? 8000 in a fixed deposit scheme for 2 yr at the rate of 5% pa compound interest. How much amount will Vandana get on maturity of the fixed deposit?
Options- A. ? 8000
- B. ? 8890
- C. ? 8888
- D. ? 8820 Discuss
- 4. 4.036 divided by 0.04 gives :
Options- A. 1.009
- B. 10.09
- C. 100.9
- D. None of these Discuss
- 5. A man spends 2/5 of his income on house rent, 3/10 on food and 1/8 on conveyance. If he has ? 2800 left with him, find his expenditure on food and conveyance together.
Options- A. ? 7000
- B. ? 5500
- C. ? 6700
- D. ? 6800 Discuss
- 6. The number obtained by interchanging the digits of a two-digit number is more than the original number by 27 and the sum of the digits is 13. What is the original number ?
Options- A. 58
- B. 67
- C. 76
- D. 85 Discuss
- 7. 2, 4, 12, 48, 240, (....)
Options- A. 960
- B. 1440
- C. 1080
- D. 1920 Discuss
- 8. The value of log2 16 is:
Options- A.
1 8 - B. 4
- C. 8
- D. 16 Discuss
- 9. X and Y can do a piece of work in 20 days and 12 days respectively. X started the work alone and then after 4 days Y joined him till the completion of the work. How long did the work last?
Options- A. 6 days
- B. 10 days
- C. 15 days
- D. 20 days Discuss
- 10. At a simple interest, a sum amounts to ? 1012 in 2 1/ 2 and becomes ? 1067.20 in 4 yr. What is the rate of interest
Options- A. 2.5%
- B. 3%
- C. 4%
- D. 5% Discuss
More questions
Correct Answer: 14 years
Explanation:
⟹ 2x = 38.
⟹ x = 19.
∴ Son's age 5 years back (19 - 5) = 14 years.
Correct Answer: 81 cm
Explanation:
Increase% = (1/8) x 100% = 12.5%
Height after 2 years =64 x {1 +25/(2 x 100)}2
= 64 x 9/8 x 9/8
= 81 cm
Correct Answer: ? 8820
Explanation:
Given, P = ? 8000, R = 5% and n = 2 Yr
According to the formula,
Amount = p ( 1 + R / 100 )n
= 8000 ( 1 + 5/100 )2
= 8000 x (105/100)2
=8000 x (21/20) x (21/20)
= 20 x 21 x 21
= ? 8820
Correct Answer: 100.9
Explanation:
| 4.036 | = | 403.6 | = 100.9 |
| 0.04 | 4 |
Correct Answer: ? 6800
Explanation:
Hint 1.
Let consider the monthly income = x ;
Amount spend on House rent = 2x/5;
Amount spend on food = 3x/10;
Amount spend on conveyance = x/8;
After Expenditure , The left amount = 2800;
According to Question;
x - ( 2x/5 + 3x/10 + x/8 ) = 2800 ;
x- ((16x + 12x + 5x)/40) = 2800 ;
x - 33x/40 = 2800 ;
(40x - 33x)40 = 2800 ;
7x/40 = 2800 ;
7x = 2800 x 40 ;
x = 2800 x 40/7 ;
x = 400 x 40 ;
x = 16000 ;
Expenditure on food = 3x/10 = 3 x 16000 /10= ? 4800
Expenditure on conveyance = x/8 = 1 x 16000/8 = ? 2000
? Expenditure on food and conveyance together
=? (4800 + 2000) = ? 6800
Solution 2 .
part of income left
= 1 - (2/5 + 3/10 + 1/8 )
=1- (16 + 12 + 5/40)
= 1- 33/40 = 40 - 33/40 = 7 /40
Let the monthly income = x
According to the question,
7/40 x = 2800
? x = 2800 x 40/7
= 400 x 40 = ? 16000
Expenditure on food = 3/10 x 16000 = ? 4800
Expenditure on conveyance = 1/8 x 16000 = ? 2000
? Expenditure on food and conveyance together
=? (4800 + 2000) = ? 6800
Correct Answer: 58
Explanation:
Let the ten's place digit = x
and unit's place digit = y
? The original number = 10x + y
After interchanging the digits
Number will become 10y + x
? according to the given question,
y + x = 13 and
(10y + x ) - (10x + y) = 27
? 9y - 9x = 27
? y - x = 3 ................(i)
and y + x = 13 .................(ii)
On solving Eqs.(i) and (ii) , we get
y = 8 and x = 5
? Required number is
10x + y = 10 x 5 + 8 = 58
Correct Answer: 1440
Explanation:
So, the correct next number is 1440.
Correct Answer: 4
Explanation:
Then, 2n = 16 = 24 ⟹ n = 4.
∴ log2 16 = 4.
Correct Answer: 10 days
Explanation:
| Work done by X in 4 days = | ❨ | 1 | x 4 | ❩ | = | 1 | . |
| 20 | 5 |
| Remaining work = | ❨ | 1 - | 1 | ❩ | = | 4 | . |
| 5 | 5 |
| (X + Y)'s 1 day's work = | ❨ | 1 | + | 1 | ❩ | = | 8 | = | 2 | . |
| 20 | 12 | 60 | 15 |
| Now, | 2 | work is done by X and Y in 1 day. |
| 15 |
| So, | 4 | work will be done by X and Y in | ❨ | 15 | x | 4 | ❩ | = 6 days. |
| 5 | 2 | 5 |
Hence, total time taken = (6 + 4) days = 10 days.
Correct Answer: 4%
Explanation:
Given, T1 = 21/2 yr, T2 = 4 Yr
According to the question.
[P + (P x R x 4)/100] - [P + (P x R x 2.5)/100] = 1067.20 - 1012 = 55.2
? (1.5 x P x R)/100 = 55.2
? PR = (552 x 100) / 15 = 3680
For 4 yr.
SI = PRT/100 = (3680 x 4)/100 = ? 147.2
? Sum (P) = 1067.2 - 147.2 = ? 920
We have, PR = 3680
? R = 3680/P = 3680/920 = 4%
Comments
There are no comments.More in Aptitude:
Programming
Copyright ©CuriousTab. All rights reserved.