A train travels a Speed of 60km /hr for 1/2hr at 30 km for next 2 hours then at 90 km/hr for 15 mins. what is the average speed of the train
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train has a speed of 60km/h for the first one hour,
t 1 =1hr, v1 =60km/hr
Distance covered by the train, d1 =v1 t1
d1=60×1=60km
For the next half hour, train has speed 40km/hr
v2 =40km/hr, t2 =0.5hr
d2=v2 t2
d2=40×0.5=20km
Total distance, d=d1+d2
d=60+20=80km
Total time, t=t1+t2
t=1hr+0.5hr=1.5hr
Average speed, v avg = d/t
v avg = 80km/1.5hr
=53.33km/hr
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