a boy runs for 20 minutes at a uniform speed of 18 km per hour at what speed should he Run for the next 40 minutes or so that the average speed comes 24 km per hour
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27km/hr is the answer
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24 = (18/3)+x*2/3 ... converting minutes to hr
x = (24*3-18)/2 = 27 km/hr
x = (24*3-18)/2 = 27 km/hr
PunitB:
average speed = total distance / total time (given total time as 1 hr or 60 minutes)
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