Time and Work - Mock Test 6

Question 51

24 men can do a piece of work in 17 days. How many men will be able to do it in 51 days ?

A) 8 B) 10 C) 12 D) 6

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Question 52

X can do a piece of work in ‘P’ days and Y can do the same work in ‘q’ days . Then the number of days in which X & Y can together do that work is?

A) (p+q)/2 B) (1/p +1/q) C) (pq)/(p+q) D) pq

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Question 53

If a man rows at the rate of 5 kmph in still water and his rate against the current is 3.5 kmph. then the man's rate along the current is?

A) 4.25 kmph B) 6 kmph C) 6.5 kmph D) 8.5 kmph

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Question 54

A man takes twice as long to row a distance against the stream as to row the same distance in favour of the stream. The ratio of the speed of the boat (in still water) and the stream is?

A) 2 : 1 B) 3 : 1 C) 3 : 2 D) 4 : 3

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Question 55

Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is?

A) 16 hours B) 18 hours C) 20 hours D) 24 hours

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Question 56

A man can row three-quarters of a kilometre against the stream in 11 minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is?

A) 2 B) 3 C) 4 D) 5

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Question 57

A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water?

A) 40 minutes B) 1 hour C) 1 hr 15 min D) 1 hr 30 min

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Question 58

A man can row 9 1/3 km/hr in still water and he finds that is thrice as much time to row u p than as to row down the same distance in river. The speed of the current is?

A) 3 1/3 km/hr B) 3 1/9 km/hr C) 1 ¼ km/hr D) 4 2/3 km/hr

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Question 59

boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9km/hr and the speed of the current is 3km/hr, the distance A and B is?

A) 4km B) 6 km C) 8 km D) 12 km

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Question 60

The speed of a boat in still water is 2km/hr. If its speed upstream be 1km/hr then speed of the stream is?

A) 1.5km/hr B) 3km/hr C) 1km/hr D) none

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