Discussion

Explanation:

Let x km/h and y km/h be the speeds of the two runners x > y

As per the question, $\frac{2}{y}-\frac{2}{x}=\frac{1}{60}$        …(1)

Also faster runner covers (x – y) km more than slower in 1 hr.

So, he will gain 2 km in $\frac{2}{(x-y)}$ hr or 1/2 hr. (30 min)

$\frac{2}{x-y}=\frac{1}{2}$ or, x – y = 4            …(2)

On solving (1) and (2), we get x = 24 km/h y = 20 km/h

Hence, option (a).

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