RRB Junior Engineer Stage 1 Model Papers 7

Question : 7 of 100

Marks: +1, -0

A train 150 m long passes a km stone in 30 seconds and another train of the same length travelling in opposite direction in 10 seconds. The speed of the second train is :

125 km/hr
25 km/hr
90 km/h
75 km/hr

Validate

Solution:

Speed of first train

150/30=5

m/sec
Let the speed of second train be x m/sec
Relative speed

= (5 + x)

m /sec

300/{5+x}=10

50 + 10x = 300

x={300-50}/10=25m{/}sec=25×18/5=90km{/}h

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