ABCD is a straight line such that AB is equals to BC is equal to CD a car travel with the speed of 40 kilometre per hour from a and a to b and with speed of 60 km per hour from B to D.Its average speed in the journey
1.from A to C
2.from A to D
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40+60=100
time is 1 h+ 1h =2 h
100 ÷ 2 = 50
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