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### Discussion :: Time and Distance

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:
2.  A. 70 km/hr B. 75 km/hr C. 84 km/hr D. 87.5 km/hr

Explanation :

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

Then 8X=$$[\frac { 400} { 4 }]=100$$

x =$$[\frac { 100} { 8 }]=12.5$$

Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.

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