Boat and Stream Problems

A boat can travel with a speed of 15 km/hr in still water. If the speed of the stream is 6 km/hr, find the time taken by the boat to go 105 km downstream.

• 2 hours

• 3 hours

• 4 hours

• 5 hours

A man's speed with the current is 18 km/hr and the speed of the current is 4.5 km/hr. The man's speed against the current is:

• 8.5 km/hr

• 9 km/hr

• 10 km/hr

• 12.5 km/hr

In one hour, a boat goes 15 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

• 10 km/hr

• 5 km/hr

• 8 km/hr

• 9 km/hr

A boat running downstream covers a distance of 18 km in 3 hours while for covering the same distance upstream, it takes 6 hours. What is the speed of the boat in still water?

• 4.5 km/hr

• 6 km/hr

• 8 km/hr

• Data inadequate

The speed of a boat in still water in 21 km/hr and the rate of current is 7 km/hr. The distance travelled downstream in 18 minutes is:

• 7.2 km

• 4.8 km

• 8.4 km

• 3.6 km

Rahul can row a certain distance downstream in 8 hour and return the same distance in 16 hour. If the speed of Rahul in still water is 12 km/hr, Find the speed of the stream.

• 2 km/hr

• 2.4 km/hr

• 3 km/hr

• 4 km/hr

A boat running upstream takes 4 hours 48 minutes to cover a certain distance, while it takes 6 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?

• 9 : 1

• 3 : 2

• 8 : 3

• Cannot be determined

A man can row 12 km in 4 hours against a stream running at 3 kmph. How long would he take in rowing the same distance down the stream?

• 1.50 hrs.

• 1.33 hrs.

• 1.20 hrs.

• 1.45 hrs.

A boat takes 8 hours to travel 64 km downstream and covers 32 km upstream in the same duration. Find the speed of the stream and that of the boat in still water.

• 3 km/hr, 9 km/hr

• 2 km/hr, 10 km/hr

• 4 km/hr, 8 km/hr

• 2 km/hr, 6 km/hr

A man can row 9 3/5 kmph in still water and he finds that it takes him twice as much time to row up than as to row down the same distance in the river. What is the speed of the current?

• 1.2 km

• 3.2 km

• 2.4 km

• 3.6 km