51). Ravi can row downstream at 9 km/h and upstream at 5 km/h. Find the speed of Ravi in still water and speed of current.
| A). 7 km/h and 2 km/h |
| B). 8 km/h and 6 km/h |
| C). 7 km/h and 3 km/h |
| D). 8 km/h and 2 km/h |
|
52). Keshav can row 60 km downstream and 36 km upstream, taking 10 h each time. What is the velocity of the current?
| A). 3 km/h |
| B). 2.2 km/h |
| C). 4 km/h |
| D). 1.2 km/h |
|
53). What time will be taken by a boat to cover a distance of 128 km along the stream, if speed of a boat in still water is 24 km/h and speed of stream is 8 km/h?
| A). 8 km/h |
| B). 4 km/h |
| C). 7 km/h |
| D). 6 km/h |
|
54). Pawan can row 24 km/h in still water. When the river is running at 4.8 km/h, it takes him 1 h to row to a place and to come back. How far is the place?
| A). 11.52 km |
| B). 14 km |
| C). 12.52 km |
| D). 15 km |
|
55). A boat has to travel upstream 20 km distance from point X of a river to point Y, The total time taken by boat in travelling from point X to Y and Y to X is 41 min 40 s. What is the speed of the boat?
| A). 66 km/h |
| B). 72 km/h |
| C). 48 km/h |
| D). Cannot be determined |
|
56). A man can row 7.5 km/h in still water. If in a river running at 1.5 km/h, it takes him 50 min to row to a place and back, how far off is the place?
| A). 3 km |
| B). 4 km |
| C). 1 km |
| D). 2 km |
|
57). Ashutosh can row 24 km/h in still water. It takes him twice as long to row up as to row down the river. Find the rate of stream.
| A). 4 km/h |
| B). 18 km/h |
| C). 8 km/h |
| D). 15 km/h |
|
58). A boat goes 12 km in 1 h in still water. It takes thrice time in covering the same distance against the current. Find the speed of the current.
| A). 8 km/h |
| B). 12 km/h |
| C). 6 km/h |
| D). 7 km/h |
|
59). A boatman takes twice as long to row a distance against the stream as to row the same distance with the stream. Find the ratio of speeds of the boat in still water and the stream.
| A). 2 : 1 |
| B). 3 : 1 |
| C). 1 : 2 |
| D). 1 : 3 |
|
60). A boat running upstream takes 528 min to cover a certain distance, while it takes 240 min to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current, respectively?
| A). 2 : 1 |
| B). 3 : 2 |
| C). 8 : 3 |
| D). Couldn't be determined |
|
