Question
A boy can swim in water with a speed of 14 km/hr in
still water. If the speed of the stream is 4 km/hr, what will be the time taken by the boy to cover 54 km downstream?Solution
Downstream Speed = (14 + 4) km/hr = 18 km/hr Time taken = 54/18 = 3 hours
The least number which when divided by 6, 7, 10, 13, and 15 leaves the same remainder 5 in each case, is:
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