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Question 1:
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
Feedback Let the speed of two trains be 7x and 8x km/hr.
Then, 8x = 400/4 =100
x=100/8 =12.5
Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.

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