Question 57

Two persons A and B are 45 km apart. If they travel in opposite direction to each other, they meetin 3 hrs. If they travel in the same direction they meet in 5 hrs. If A travels faster than B, then the speed of A, in kmph, is

Solution

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Let the speed of A be a kmph and speed of B be b kmph

Hence, in first case: a + b = (45/3) = 15 kmph
In second case, a - b = 45/5 = 9 kmph 

Addding the 2 equations, we get a = 12 kmph 

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