A boat covers 40 km upstream and 90 km downstream in 5 hr. It can also cover 60 km upstream and 60 km downstream in 5 hr. The speed of the water current is
4 km/hr
5 km/hr
20 km/hr
25 km/hr
Additional Questions
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Two champion swimmers start a two-length swimming race at the same time, but from opposite ends of the pool. They swim at constant but different speeds. They first pass at a point 18.5 m from the deep end. Having completed one length, each swimmer take |
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A and B start together from the same point on a circular track and walk in the same direction till they both again arrive together at the starting point. A completes one circle in 224 s and B in 364 s. How many times will A have passed B? |
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36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ? |
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Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in: |
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