In a journey of 120 km a train covers first
30 km with the speed of 30 Km/hr.How fast
the train should move to overcome remaining distance. so that the average speed will be 60 Km/hr
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11th
Physics
Motion in a Straight Line
Speed and Velocity
On a 120 km track, a train ...
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Asked on December 20, 2019 by
Smarita Bhargava
On a 120 km track, a train travels the first 30 km with a uniform speed of 30 km/h. How fast must the train travel the next 90 km so as to average 60 km/h for the entire trip?
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ANSWER
Average speed=Total distance Total time taken
V
av
=
t
d
ort=
V
av
d
For 120 km,
t=
60 km/hr
120 km
=2 hr ......(i)
For 1st 30 km,
t
1
=
30 km/hr
30 km
=1 hr
For remaining 90 km,
t
2
=t−t
1
=2−1=1 hr
speed=
time
distance
or v
2
=
t
2
d
2
=
1
90
=90 km/hr
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