A man can row 32 km/hr in still water. It takes him thrice as long to row up as to row down the river. Find the rate of the current.

Let man’s rate upstream be x kmph. Then his rate downstream = 3x kmph. ∴Rate in still water =1/2 (3x+x)kmph=2x kmph ⇒32 = 2x⇒x = 16⇒3x=48 ∴ Rate of the stream =1/2 (48-16)kmph=16 kmph Alternate Method: Let U = speed of man in still water & V = speed of water So here N = time of upstream/ time of downstream = 3 So U/V = (N+1)/(N-1) = (3+1)/(3-1) = 4/2 =2 V = 32/2 = 16kmph

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- The speed of a boat in downstream is 20% more than speed of boat in still water. If the boat travels a distance of 90 km upstream in 15 hours then find the time taken by the boat to cover a distance of 252 km in downstream.
- Speed of a boat in still water is 15 kmph and speed of stream is 12 kmph. A man rows to a place at a distance of 81 km and come back to starting point. The total time taken by him is:
- Nobita can row from a point A against a current for 30 minutes and then come back in favour of the current for the next 30 minutes and comes to the point B. If the distance of AB is 2`2/5` km, then find the speed of the current (in km/hr)?
- A boat makes a journey from point P to point Q and return back in 6 hr 40 min. One way it travels with the stream and on the return it travel against the stream. Prdouct of speed in downstream and upstream is 216. If the speed of the stream increase by 2 km/hr, the return journey takes 7 hr 12 min. What is the speed of the boat in still water? The distance between P and Q is 48 km.
- A boy can swim in water with a speed of 15 km/hr in still water. If the speed of the stream is 8 km/hr, what will be the time taken by the boy to cover 69 km downstream?
- A man can row his boat with the stream at 42 km/h and against the stream in 7 km/hours. The man’s rate is
- Speed of a boat in still water is 10 kmph and speed of stream is 6 kmph. A man rows to a place at a distance of 32 km and come back to starting point. The total time taken by him is:
- Sumit can swim 12 km upstream and 16 km downstream in 5 hours. If ratio of speed of stream to that of speed of Sumit in upstream is 1:2, then find the speed of Sumit in still water.
- Find the total distance covered by boat in each upstream and downstream in 5 hours if the speed of boat in still water and speed of current is 20 km/h and 6 km/h respectively?

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