Hi,
A son and father goes for boating in river upstream . After
rowing for 1 mile son notices the hat of his fathe falling in the
river.After 5 min. he tells his father that his hat has fallen. So they turn
round and are able to pick the hat at the point from where they began
boating after 5min. Tell the speed of river? The answer is 6miles/hr. Can
anyone say how..??
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