Boats & Streams combined

A boat takes 12 hours to cover an upstream distance of 48 km and 6 hours to come back same distance in downstream. What is the speed of boat in steel water?

• 6 kmph

• 8 kmph

• 4 kmph

• 10 kmph

A swimmer can swim 33⅓% faster in downstream than in upstream. He takes 4 hours to swim a distance of 32 km in still water. Speed of stream is how much percent of upstream speed?

• 16.33%

• 12.25 %

• 16.67%

• 14.28 %

Rohit and Mohit are coming via boat towards each other from the two banks of a river. They meet after three hours from start. If speed of both boats in still water is 6 kmph and river is flowing from Mohit towards Rohit, then find the distance between two banks.

• 18 km

• 36 km

• 24 km

• 48 km

A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is

• 3 kmph

• 5kmph

• 4kmph

• 2kmph

A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat in still water and speed of the water current respectively?

• 2:1

• 3:2

• 4:5

• 8:3

A boat takes 9hr to travel a distance upstream and takes 6hr to travel the same distance downstream. If the speed of the boat in still water is 4 kmph, then what is the velocity of the stream?

• 0.8

• 0.3

• 0.7

• 0.4

A boat has to travel upstream 20 km distance from point X of a river to point Y. The total time taken by boat in travelling from point X to Y and Y to X is 41 min 40 s. What is the speed of the boat?

• 66 kmph

• 77kmph

• 88kmph

• cannot be determined

A steamer goes downstream from one port to another in 4 hr. It covers the same distance upstream in 5 hr. If the speed of the stream is 2 kmph, then find the distance between the two ports.

• 80

• 45

• 55

• 65

The ratio of speeds of a motorboat to that of the current of water is 36 : 5. The motorboat goes along with the current in 5 hours 10 min. Find the time taken by motorboat to come back.

• 5 hours 50 min

• 6 hours

• 12 hours 10 min

• None of these

 $\sqrt{\frac{400}{7}\%\ of\ 1372\ +\frac{16}{17}of\ 2499}$  

• 58

• 54

• 66

• 56