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(#M40018374) REVENUE OFFICER question TRAINS problems Keep an EYE

I) Trains A and B are travelling on the same route heading towards the same destination.Train B has already covered adistance of 220km before the train a started
II)The two trains meet each other after 11 hours after start of train 'A'
III)Had the trains been travelling towrds each other(from a distance of 220 km) they would have met after 1 hour
Q1) what is the speed of train 'B' in kmph:
a)100
b)180
c)116
d)none
Q2)What is the spped of train of 'A' in kmph:
a)102
b)80.5
c)118
d)none

Asked In REVENUE OFFICER C.Manohar (11 years ago)

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Rahul Relan  (11 years ago)

Ans: Q1 a(100) Q2 d(none)
Let speed of train A=x kmph,B=y kmph
if they head towards each other
then distance covered by each train before they met is x km and y km since time taken is 1hour
therefore x+y=220 .......eq(1)
if they move in same direction then suppose train B covered a km when they met
then a=y*11 (time is 11hours)
similarly for train A 220+a=x*11
removing a will give x-y=20
from eq(1) x+y=220
this will give x=120kmph
and y=100kmph

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