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2015-04-28T18:08:29+05:30

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Total distance = 39 km
total duration = 45 min = 45/60 = 3/4 hour

x kmph for 15 min => distance travelled = 15/60 * x = x/4 km
2 x kmph for 20 min => distance travelled = 20/60 * 2x = 2x/3  km
x kmph for  (45 - 20 -15) min => distance = 10/60 * x = x/6  km

total distance = x/4 + 2x/3 + x/6 = x [ 1/4 + 2/3 + 1/6 ] = 13/12 * x
                   13/ 12 * x = 39 km

                   x = 39/13 * 12 = 36 kmph


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