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Q1
:
The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 km in 4 hours, then the speed of the first train is:
A
70 km/hr
B
75 km/hr
C
84 km/hr
D
87.5 km/hr
Solution
ANS:
D
- 87.5 km/hr
Let the speed of two trains be 7
x
and 8
x
km/hr.
Then, 8
x
=
400
= 100
4
x
=
100
= 12.5
8
Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.
Share :
Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.