A person covers 50 percent distance at the rate of 12 km per hour and te remaining distance at 16 km per hour.find his average sped during the journey
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Your answer is 13.71 km/hr.
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Let the distance be x km .
Half of distance = x/2 km .
speed = 12 km /hr
Time = d/s = x/2 x 1/12 = x/24 hr
Again d = x/2 km
Speed = 16 km/hr
Time = x/2 x 1/16 = x/32 hr
Total time = x/24 + x/32 = 7x/96 hr
Average Speed = total distance / total time
= x/7x × 96 = 96 /7 = 13 5/7 km/hr
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