A train travels at a speed of 60km /h for 0.52h .at 30km/hfor next 0.24h mad then at 70km/h for next 0.71.what is the average speed of the train
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distance =speed *time
d1=60*0.52=31.2km/h
d2=30*0.24=7.2km/h
d3=70*0.71=49.7km/h
average speed=total distance/total time
=d1+d2+d3/t1+t2+t3
=31.2+7.2+49.7
0.52+0.24+0.71
=88.1
1.47
=59.93km/h
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