# A Passenger train takes 3 hours lessfor a journey of 140 km . If the speed is increased by 42 kmph from its normal speed then The normal speed is ?

2
by harshi03

• Brainly User
2014-10-06T21:01:00+05:30
Original time taken by the passenger train = x
distance = 140 km
time taken by the passenger train = x-3
normal speed = a
travelled speed = a +42
speed = d/t
d = speed *t
(x-3)(a + 42) = xa
xa +42x -3a -126 =xa
42x = 3a +126 =140
3a = 140 - 126
3a = 14
a = 14/3 Kmph

sorry this answer might be wrong
2014-10-06T21:06:53+05:30

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Let the normal speed of train = x km/h
time taken to cover 140 km =  h

If the speed is increased by 42 km/h from its normal speed, journey becomes 3 hours less.
speed = (x+42)km/h
time  =

Solving the equation, we get x= 28 or -72. ignore -72 as speed can't be negative.

So the normal speed of train is 28 km/h