Boats

A boat goes 24 km upstream and 28 km downstream in 6 hours. It goes 30 km upstream and 21 km downstream in 6 hours and 30 minutes. The speed of the boat in still water is

• 4km/hr

• 10km/hr

• 14 km/hr

• 6 km/hr

A man rows to a place 48 km distant and back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is

• 1 km/hr

• 1.5 km/hr

• 1.8 km/hr

• 3.5 km/hr

A boatman rows to a place 45 km distant and back in 20 hours. He finds that he can row 12 km with the stream in the same time as 4km against the stream. Find the speed of the stream.

• 3 km/hr

• 2.5 km/hr

• 4 km/hr

• can't be determined

A man wishes to cross a river perpendicularly. In still waters, he takes 4 minutes to cross the river, but in flowing river he takes 5 minutes. If the river is 100 metres wide, then the velocity of the flowing water of the river is

• 15 m/sec

• 30 m/sec

• 10 m/sec

• 20 m/sec

On a river, Q is the midpoint between two points P and R on the same bank of the river. A boat can go from P to Q and back in 12 hours and from P to R in 16 hours 40 mm. How long would it take to go from R to P?

• 3(1/3) h

• Sh

• 6(2/3) h

• None of These

A man can row 7.5 km/h in still water. It takes him twice as long as to row up as to row down the river. Find the speed of the stream

• 8.5 km/h

• 7.5 km/h

• 2.5 km/h

• 4.5 km/h

A boat sails downstream from a point A to point B, which is 10 km away from A, if the actual speed of boat in still water is 3 km/hr, the trip from A to B takes 8 hours less than that from B to A What must be actual speed of the boat for the trip from A to B to take exactly 100 min?

• 1 km/hr

• 2 km/hr

• 3 km/hr

• 4 km/hr

A motorboat went downstream for 28 km and immediately returned. It took the boat twice as long to make the return trip. If the speed of the river flow were twice as high, the trip downstream and back would take 672 minutes. Find the speed of the boat in still water and the speed of the river flow is...

• 9 km/h. 3 km/hr

• 9 km/h, 6 km/hr

• 8 km/h, 2 km/hr

• 12km/hr, 3km/hr

Vijay can row a certain distance downstream in 6 h and return the same distance in 9 h. If the stream flows at the rate of 3 km/h, find the speed of Vijay in still water.

• 12 km/h

• 13 km/h

• 14 km/h

• 15 km/h

In a stream, B lies in between A and C such that it is equidistant from both A and C. A boat can go from A to B and back in 6 h 30 minutes while it goes from A to C in 9 h. How long would it take to go from C to A?

• 3.75 h

• 4 h

• 4.25 h

• 4.5 h