Aptitude:: Time and Distance

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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

Answer: Option D

Explanation:

 

Let the speed of two trains be 7x and 8x km/hr.

Explanation:

 

Let the speed of two trains be 7x and 8x km/hr.

 

<img src="http://latex.codecogs.com/gif.latex?\frac{5&plus;t}{78}" title="\frac{5+t}{78}" />

 

 


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