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  1. A train travelling with uniform speed crosses two bridges of lengths 300 m and 240 m in 21
    seconds and 18 seconds respectively. The speed of the train is :
    1. 72 km/hr
    2. 68 km/hr
    3. 65 km/hr
    4. 60 km/hr
Correct Option: A

Let the length of the train be x.

∴  Speed of the train =
x + 300
=
x + 240
2118

⇒ 
x + 300
=
x + 240
76

⇒  7x + 1680 = 6x + 1800
⇒  x = 120
∴  Speed of the train =
x + 300
=
420
= 20 m/sec
2121

=
20 × 18
kmph = 72 kmph
5


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