Question
In a fixed time, a boy swims thrice the distance along
the current that he swims against the current. If the speed of the current is 6 km/hr, the speed of the boy in still water isSolution
Let the rate of swimming in still water be x km/hr Rate down-stream = (x + 6) km/hr Rate up-stream = (x – 6) km/hr According to the question, (x + 6) t = 3 (x – 6) × t x + 6 = 3x – 18 x = 12 km/hr
There are seven hemispherical containers of radius R metres each and each of them is fully filled with water. The water in these is transferred to a hem...
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