RRB RPF RPSF SI and CONS Model Papers 7 with solutions

Question : 68 of 120

Marks: +1, -0

Two trains of lengths 70 m and 80 m are running at speeds of 68 km/hr and 40 km/hr rspectively on paralled tracks in opposite directions. In how many seconds will they pass each other ?

Validate

Solution:

(3) Tricky Approach
Relative speed = (68 + 40) kmph = 108 kmph

= ( {108× 5}/{18} )

m/sec. = 30 m/sec
∴ Required time

=\text" Sum of the lengths of both trains "/\text" Relative speed "

= ( {70+80}/{30} )

second

= 5

second

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