31). A boat covers a distance of 30 km downstream in 2 h while it takes 6 h to cover the same distance upstream. What is the speed of the boat (in km/h)?
A). 5 |
B). 7.5 |
C). 13 |
D). 10 |
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32). A boat's speed in still water is 5 km/h. While river is flowing with a speed of 2 km/h and time taken to cover a certain distance upstream is 2 h more than time taken to cover the same distance downstream. Find the distance.
A). 10.5 km |
B). 11 km |
C). 10.9 km |
D). 15 km |
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33). A boat takes 9 h to travel a distance upstream and takes 3 h to travel the Same distance downstream. If the speed of the boat in still water is 4 km/h. then what is the velocity of the stream?
A). 4 km/h |
B). 3 km/h |
C). 6 km/h |
D). 2 km/h |
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34). A boat running upstream distance of 10 km in 30 min and while running downstream, it covers the same distance in 25 min. What is the speed of the river current (in km/h)?
A). 20 |
B). 2.2 |
C). 2 |
D). Couldn't be determined |
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35). A man can row at 10 km/h in still water. If he takes total 5 h to go to a place 24 km away and return, then the speed of the water current is
A). 2 km/h |
B). 3 km/h |
C). \( \Large \frac{1}{2} \) km/h |
D). 1 km/h |
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36). A steamer goes downstream from one port to another in 4 h. It covers the same distance upstream in 5 h. If the speed of the stream is 2 km/h, then find the distance between the two ports.
A). 50 km |
B). 60 km |
C). 70 km |
D). 80 km |
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37). A man can row \( \Large 7\frac{1}{2} \) 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 |
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38). 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 |
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39). 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 |
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40). 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 |
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