3i-Infotech
Company
Numerical Ability
Time Distance and Speed
Q. A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?
Option
A. 69.5 km/hr
B. 70 km/hr
C. 79 km/hr
D. 79.2 km/hr
Read Solution (Total 3)
-
- Option D 79.2 Km/hr
Let the length of the train is x
x/8=x+264/20
on solving this we get x=176 m
Speed of the train=176/8=22m/sec
22*18/5=396/5=79.2 Kmph - 12 years agoHelpfull: Yes(6) No(0)
- Ans: D
Let the length of train be x meters and its speed is y m/sec
then x/y = 8 => x = 8y
Now (x+264)/20 = y => 8y+264 = 20y => y = 22
Therefore Speed = 22 m/s = (22*18/5) = 79.2 km/hr - 11 years agoHelpfull: Yes(3) No(1)
- the ans is 79.2km/hr
let length of the train be x then x/8=x+264/20 by solving it we get x=176
then speed s=176/8
s=22*18/5
s=79.2km/hr - 8 years agoHelpfull: Yes(0) No(0)
3i-Infotech Other Question