A train has a speed of 60 kh/h for the first one hour and 40 km/h for the next half hour its average speed in km/h is what
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with the speed of 60km/hr. in 1 hour,
distance=60×1=60kms
with the speed of 40km/hr. in 1/2 hour,
distance=40×1/2=20kms
total distance travelled by the train=60+20
D=80kms
total time, T=1+1/2=3/2 hours
then average speed of the train=80/3/2
=80×2/3
=160/3
=53.3km/hr.
distance=60×1=60kms
with the speed of 40km/hr. in 1/2 hour,
distance=40×1/2=20kms
total distance travelled by the train=60+20
D=80kms
total time, T=1+1/2=3/2 hours
then average speed of the train=80/3/2
=80×2/3
=160/3
=53.3km/hr.
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