There is a road beside a river.Two friends started from a place A, moved to a temple situated at another place B and then returned to A again. One of them moves on a cycle at a speed of 12 km/hr, while the other sails on a boat at a speed of 10 km/hr. If the river flows at the speed of 4 km/hr, which of the two friends will return to place A first ?
none of the above
Clearly, the cyclist moves both ways at a speed of 12 km/hr.
So, average speed of the cyclist = 12 km/hr.
Average speed = (2x14x6/14+6) km/hr
= 42/5 kmph
= 8.4 kmph
Since the average speed of the cyclist is greater, he will return to A first.
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