1. The speed of the current is 5 km/h. A boat goes 10 km upstream and back again to the starting point in 50 min. Find the speed of the boat in still water.
2. In a fixed time, a boy swims \(\frac{5}{2}\) times the distance along the current that he swims that he swims against the current. If the speed of the current is 6 km/h. Find the speed of the boy in still water.
3. The speed of a motor boat in still water is 60 km/h. If the motor boat travels 90 km along the stream in 1h 7min 30sec, then find the time taken by it to cover the same distance against the stream.
4. Two boats A and B start towards each other from two places, 112 km apart. Speed of the boat A and B in still water are 8 km/h & 14 km/h respectively. If A proceeds downstream & B proceeds upstream then after how much time they will meet ?
5. A person can row 12 km/h in still water and he finds that it takes him twice as long to row up as to row down the river. Find the speed of the stream.
6. A boat goes 42 km upstream in 7 hours and 40 km downstream in 5 hours. Find the speed of the boat in still water.
7. A man can row at a speed of 18 km/h in still water. If he takes 2 times as long to row a distance upstream as to row the same distance downstream then find the speed of the stream.
8. The speed of a motor boat to that of current of water is 30 : 7. The boat goes along the current in 4h 36 min. Find the time when it will come back ?
9. The speed of a boat in still water is 8 km/h and the speed of the stream is 3 km/h. A man rows to a place at a distance of 41.25 km and comes back to the starting point. Find the total time taken by him.
10. If the speed of boat in still water is 5 km/h and upstream speed is 3 km/h. Find the speed of the current.