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for the average speed of the 100km journey to be 40kmph the total time taken must be 2½hrs...
if it travels first 30km at the speed of 30kmph it means it took 1hr in traveling this 30 km...
so he have to travel the next 70km in 1½hrs
I.e; it's speed for the next 70km should be (70÷1½)kmph
=140/3kmph
=46.66kmph
if it travels first 30km at the speed of 30kmph it means it took 1hr in traveling this 30 km...
so he have to travel the next 70km in 1½hrs
I.e; it's speed for the next 70km should be (70÷1½)kmph
=140/3kmph
=46.66kmph
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