A boy walk a certain distance and ride back taking a total of 28 minutes. He could walk both ways in 42 minutes. How long would it take him to ride both ways ?
Solution: Let the distance be x km. then,
(time taken to walk x km) + (time taken to ride x km) = 28 min.
Time taken to walk 2x km + time taken to ride 2x km = 2*28 = 56 min.
But, time taken to walk 2x km = 42 min.
.'. Time taken to ride 2x km = (56 - 42) min = 14 min.
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