Aptitude - Arithmetical Ability

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31.

If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is :?                          
A. 4.2 km/hr B. 13 km/hr
C. 9 km/hr D. 21 km/hr



32.

A boat goes 13 km upstream in 39 minutes. The speed of stream is 3 km/hr. The speed of boat in still water is:?                          
A. 23 km/hr B. 27 km/hr
C. 25 km/hr D. None of these



33.

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.        1:2 B.        1:3
C.        2:1 D. 3:01




34.

The speed of a boat in still water is 10 km/hr. If it can travel 26 km downstream and 14 km upstream in the same time, the speed of the stream is:?                          
A. 2 km/hr B. 2.5 km/hr
C. 3 km/hr D. 4 km/hr



35.

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.        30 minutes B. 45 minutes
C. 1 hour D. 1 hour 15 min



36.

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 hour 15 min D. 1 hour 30 min



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