A car travels 20km at a uniform speed of 40 km/h &the next 20km with a uniform speed of 60 km/ h. Find its avg. Speed ?
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t1 = d1 / v1
= 20 / 40 = 0.5h
t2 = d2 / ve
= 20 / 60 = 0.3h
Total time(t) = t1 + t2
= 0.5 + 0.3 = 0.8h
Now average speed = Total dist. / Total time
= (20 + 20) / 0.8
= 40 / 0.8
= 50 km/hr
Thanks
= 20 / 40 = 0.5h
t2 = d2 / ve
= 20 / 60 = 0.3h
Total time(t) = t1 + t2
= 0.5 + 0.3 = 0.8h
Now average speed = Total dist. / Total time
= (20 + 20) / 0.8
= 40 / 0.8
= 50 km/hr
Thanks
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