a car travels along a straight line with speed 40 km per hour from A toB and returns back from B to A with speed 60 km per hour find the average speed
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let the distance be x
time =distance/speed
time 1 =x/40
time=x/60
average speed=total distance /total time
= x+x/x/40 + x/60
2x/3x+2x/120
=2x×120/5x
2×24
48m/s-1
time =distance/speed
time 1 =x/40
time=x/60
average speed=total distance /total time
= x+x/x/40 + x/60
2x/3x+2x/120
=2x×120/5x
2×24
48m/s-1
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