Maths olympiad
Exam
Numerical Ability
A train 180m long, moving at 45km/hr crosses a second train 250m long coming in the opposite direction in 20 seconds. Find the speed of the second train.
Read Solution (Total 3)
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- 32.4 km/hr
If speed of other train=x km/hr,Converting length in meters to Km. and time in seconds to hour.
Time to cross=(0.18+0.25)/(45+x) = 20/3600, x=32.4 - 9 years agoHelpfull: Yes(0) No(0)
- The speed of the 2nd train is=X km/hr then
(X+45)*5/18=430/20
x=32.4 - 9 years agoHelpfull: Yes(0) No(0)
- Let speed of second train be x km/hr
distance covered in 20 sec= (45+x)*(5/18)*20=430
so x=32.4 km/hr - 7 years agoHelpfull: Yes(0) No(0)
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