A man, on tour travel first 160 km, at 64 km/hr. and the next 160km at 80km/hr.

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Question
A man, on tour travel first 160 km, at 64 km/hr. and the next 160km at 80km/hr. the average speed for the first 320 km. of the tour is?
Options
A. 35.55km/hr.
B. 71.11km/hr.
C. 36km/hr.
D. 72km/hr.

Correct Answer

71.11km/hr.

Explanation

Average speed = 2t₁ x t₂/( t₁ + t₂)
= (2x64x80)/(64+80)km
= (2 x 64 x 80 ) / 144 km/hr.
=71.11km/hr.

Time and Work problems

Search Results

1.
Currants at Rs. 50 per kg are mixed with currants at Rs. 90 per kg to make a mixture of 17 kg worth Rs. 70 per kg. How many kilograms of each are taken?
Options
A. 8 kg, 9 kg
B. 8 1 kg of each 2
C. 7 kg, 10 kg
D. None of these

2.
729 ml of a mixture contains milk and water in the ratio 7 : 2. How much more water is to be added to get a new mixture containing milk and water in ratio 7 : 3?
Options
A. 600 ml
B. 710 ml
C. 520 ml
D. None of these

3.
Two casks of 48 and 42 liters are filled with mixture of wine and water13 : 7 and 18 : 17. If the contents of the two casks be mixed and 20 liters of water added to the whole what will be the proportion of wine to water in the result?
Options
A. 13 : 12
B. 12 : 13
C. 21 : 31
D. 31 : 21

4.
A solution of sugar syrup has 15 % sugar. Another solution has 5 % sugar. How many liter of the second solution must be added to 20 liters of the first solution to make a solution of 10 % sugar?
Options
A. 10
B. 5
C. 15
D. 20

5.
From a vessel filled with alcohol 1/5 of its contents is removed and the vessel is then filled up with water. If this be done 5 times in succession, what proportion of the alcohol originally contained in the vessel will have been removed from it?
Options
A. 1024 3125
B. 2101 3125
C. 1024 2101
D. None of these

6.
By walking at 3/4 of his usual speed, a man reaches his office 20 minute later than usual. this usual time is?
Options
A. 30 minute
B. 60 minute
C. 75 minute
D. 1 hour 30 minute

7.
A man travels 35 km partly at 4 km/hr and at 5 km/hr. If he covers former distance at 5 km/hr and later distance at 4 km/hr, he could cover 2 km more in the same time. The time taken to cover the whole distance at original rate is
Options
A. 9 hours
B. 7 hours
C. 4.5 hours
D. 8 hours

8.
6 men or 10 women can reap a field in 15 days, then the number of days that 12 men and 5 women will take to reap the same field is :
Options
A. 5
B. 6
C. 8
D. 12

9.
6 children and 2 men complete a certain piece of work in 6 days. Each child takes twice the time taken by a man to finish the work. In how many days will 5 men finish the same work?
Options
A. 6
B. 8
C. 9
D. 15

10.
2 men or 5 women or 7 boys can finish a work in 469 days, then the number of days taken by 7 men, 5 women and 2 boys to finish the work is :
Options
A. 134
B. 106
C. 100
D. 98

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