self Interview Logical Reasoning

The sum of the ages of a son and father is 65 years. After 5 years the age of father will be
double of the age of son. What is the age of son?

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self Other Question

there are 4 persons to cross the bridge.only two persons can cross at a time and they are having only one torch.their speeds to cross the bridge is 1min,2min,5min,10min. if two persons cross the bridge they cross with slowest persons speed.what is the minimum and maximum time takes to cross the bridge?? A man can row 5 kmh"1 in still water. If the stream is flowing at the speed of 3 kmh-1, it
takes him 15 hrs to row to a place and come back. What is the distance between the two
places?