Question

A father can do a job twice as fast as his two sons combined. If his one son can do a job in 3 hours and other in 6 hours. How much time will the father take to complete the job?

Answer 1

Answer:

Work done by Son1 in one day=1/24

Work done by Son2 in one day=1/40

Work done by both in one day=1/24+1/40 =8/120 = 1/15

Therefore, Time takby both sons to complete work=Time taken by father to complete work=15

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