Boats and Streams

A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

• 2 hours

• 3 hours

• 4 hours

• 5 hours

A man's speed with the current is 15 km/hr and the speed of the current is 2.5 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 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:

• 3 km/hr

• 5 km/hr

• 8 km/hr

• 9 km/hr

A boat running downstream covers a distance of 16 km in 2 hours while for covering the same distance upstream, it takes 4 hours. What is the speed of the boat in still water?

• 4 km/hr

• 6 km/hr

• 8 km/hr

• Data inadequate

The speed of a boat in still water in 15 km/hr and the rate of current is 3 km/hr. The distance travelled downstream in 12 minutes is:

• 1.2 km

• 1.8 km

• 2.4 km

• 3.6 km

Rahul can row a certain distance downstream in 6 hour and return the same distance in 9 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

• 1.5 km/hr

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 and speed of the water current respectively?

• 2 : 1

• 3 : 2

• 8 : 3

• Cannot be determined

A man can row 9 km in 3 hours against a stream running at 2 kmph. How long would he take in rowing the same distance down the stream?

• 70 minutes

• 32.88 minutes

• 83.23 minutes

• 77.14 minutes

A boat goes up a river 20 km and down the river 24 km in 8 hours. It also goes up the river 30 km and down the river 28 km in 11 hours. What is the speed of the boat and the river?

• 2 km/hr, 1.5 km/hr

• 6 km/hr ,2 km/hr

• 3 km/hr ,1.5 km/hr

• 1.5 km/hr,4 km/hr

A man can row 9 and 1/3 kmph in still water and finds that it takes him thrice as much time to row up than as to row, down the same distance in the river. The speed of the current is

• 4 2/3km/hr

• 6 2/3km/hr

• 10 1/3km/hr

• 7 2/3 km/hr