Trains Boats and Streams Practice Test 3 with solutions

Question : 28 of 40

Marks: +1, -0

Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other. What is the speed of the faster train?

75 km/hr
60 km/hr
45 km/hr
30 km/hr

Validate

Solution:

Let speeds of two trains be x and 2x m/s; then

{100+100}/8

= x + 2x
⇒ 3x = 25
∴ x =

{25}/3

m/s
Speed of faster train = 2 ×

{25}/3

m/s =

{50}/3 × {18}/5

km/hr = 60 km/hr

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