Boats and Stream
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41 A man can row 6 km/h in still water. If the speed of the current is 2 km/h, it takes 3 h more in upstream than in the downstream for the same distance. The distance is
42 The current of a stream runs at 1 km/h. A motor boat goes 35 km upstream and back again to the starting point in 12 hours. The speed of the motor boat in still water in km/h is :
43 A sailor sails a distance of 48 km along the flow of a river in 8 h. If it takes 12 h to return the same distance, then the speed of the flow of the river is
44 A boatman goes 2 km against the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will he take to go 5 km in stationary water?
45 The speed of a boat in still water is 6 km/h. It takes the boat twice as long to row up as to row down the river. Find the rate of the stream:
46 Devika can travel 12 miles downstream in a certain river in 6 hours less than it takes him to travel the same distance upstream. But if he could double his usual rowing rate for his 24-mile round trip, the downstream 12 miles would take only one hour less than the upstream 12 miles. What is the speed of the current in miles/hour?
47 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:
48 There is a road beside a river. Two friends started from a place A, moved to a temple situated at another place B and then returned to A again. One of them moves on a cycle at a speed of 12 km/hr, while the other sails on a boat at a speed of 10 km/hr. If the river flows at the speed of 4 km/hr, which of the two friends will return to place A first?
