a train moves with a speed of 30 km per hour in the first 15 minutes with the another speed of 40 km per hour in the next 15 minutes and then with a speed of 60 km per hour in the last 30 minutes calculate the average speed of the train for the journey
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with the speed of 30km/hr. in 15 mins.
d=30×15/60
d=15/2km
with the speed of 40km/hr. in 15 mins.
d=40×15/60
d=10km
with the speed of 60km/hr. in 30 mins.
d=60×30/60
d=30kms
so, total distance travelled by train=15/2+10+3
D=95/2
and total time=15+15+30
T=60mins or 1 hr
we know that S=D/T
then average speed of train=95/2/1
arg. S= 47.5kms/hr.
d=30×15/60
d=15/2km
with the speed of 40km/hr. in 15 mins.
d=40×15/60
d=10km
with the speed of 60km/hr. in 30 mins.
d=60×30/60
d=30kms
so, total distance travelled by train=15/2+10+3
D=95/2
and total time=15+15+30
T=60mins or 1 hr
we know that S=D/T
then average speed of train=95/2/1
arg. S= 47.5kms/hr.
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