A boy ran for 30 min then he walks for the same time to cover a total distance 2.5 km . the boy runs with the speed of 4 kmph . what is the speed with which the boy walks ?
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Time for forward journey t1=2.56=512=2.4 hr
Time for backward journey t2 = 46 = 1.5 hr
Average speed =2.4+1.56+6=3.912=1340 km/hr
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