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- Question
If a boat goes a certain distance at 30 km/h and comes back the same distance at 20 km/hr, what is the average speed (in km/hr) for the total journey?
Options- A. 25
- B. 24.5
- C. 24
- D. 25.5
- Correct Answer
- 24
- 1. A man can row upstream at 12 km/hr and downstream at 18 km/hr. The man's rowing speed in still water is
Options- A. 15 km/hr
- B. 5 km/hr
- C. 3 km/hr
- D. 10 km/hr Discuss
- 2. If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is
Options- A. 2 hrs
- B. 3 hrs
- C. 4 hrs
- D. 7 hrs Discuss
- 3. Speed of a boat along and against the current are 14 kms/hr and 8 kms/hr respectively. The speed of the current is
Options- A. 11 kms/hr
- B. 6 kms/hr
- C. 5.5 kms/hr
- D. 3 kms/hr Discuss
- 4. A boat covers 63 km upstream in 9 hours and covers the same distance downstream in 7 hours . What is the speed (in km/ hr) of the boat in still water?
Options- A. 8.7
- B. 8.5
- C. 7
- D. 8 Discuss
- 5. Ashok can row upstream at 8 kmph and downstream at 12kmph.What is the speed of the stream ?
Options- A. 6 km/hr
- B. 3 km/hr
- C. 2 km/hr
- D. 4.5 km/hr Discuss
- 6. If a boat goes upstream at a speed of 18 km/hr and comes back the same distance at 30 km/hr. What is the average speed (in km/hr) for the total journey?
Options- A. 22.5
- B. 24
- C. 20.5
- D. 25 Discuss
- 7. What was the day on 15th august 1947 ?
Options- A. Friday
- B. Saturday
- C. Sunday
- D. Thursday Discuss
- 8. Today is Monday. After 61 days, it will be :
Options- A. Tuesday
- B. Monday
- C. Sunday
- D. Saturday Discuss
- 9. The last day of a century cannot be
Options- A. Monday
- B. Wednesday
- C. Tuesday
- D. Friday Discuss
- 10. What was the day of the week on, 16th July, 1776?
Options- A. Tuesday
- B. Wednesday
- C. Monday
- D. Saturday Discuss
Boats and Streams problems
Search Results
Correct Answer: 15 km/hr
Correct Answer: 4 hrs
Correct Answer: 3 kms/hr
Correct Answer: 8
Correct Answer: 2 km/hr
Explanation:
If the speed downstream is a kmph and the speedup stream is b kmph then
Speed of the stream = 1/2 x (a?b) kmph
Speed downstream a = 12kmph
Speed upstream b = 8 kmph
Speed of the stream = 1/2 x (a?b) = 1/2 x (12?8)= 4/2 = 2 kmph
Correct Answer: 22.5
Correct Answer: Friday
Correct Answer: Saturday
Explanation:
Each day of the week is repeated after 7 days. So, after 63 days, it will be Monday.
After 61 days, it will be Saturday.
Correct Answer: Tuesday
Correct Answer: Tuesday
Explanation:
16th July, 1776 = (1775 years + Period from 1st Jan, 1776 to 16th July, 1776)
Counting of odd days :
1600 years have 0 odd day.
100 years have 5 odd days.
75 years = (18 leap years + 57 ordinary years) = [(18 x 2) + (57 x 1)] = 93 (13 weeks + 2 days) = 2 odd days
1775 years have (0 + 5 + 2) odd days = 7 odd days = 0 odd day.
Jan Feb Mar Apr May Jun Jul
31 + 29 + 31 + 30 + 31 + 30 + 16 = 198 days= (28 weeks + 2 days)
Total number of odd days = (0 + 2) = 2.
Required day was 'Tuesday'.
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