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Problems on Trains
A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?
69.5 km/hr
70 km/hr
79 km/hr
79.2 km/hr
Correct Answer:
79.2 km/hr
Explanation:
Let the length of the train be
x
metres and its speed by
y
m/sec.
Then,
x
= 8 ⟹
x
= 8
y
y
Now,
x
+ 264
=
y
20
⟹ 8
y
+ 264 = 20
y
⟹
y
= 22.
∴ Speed = 22 m/sec =
❨
22 x
18
❩
km/hr = 79.2 km/hr.
5
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