Discussion

Question:

Ankush can cover a certain distance in 21 mins. He covers two third of it at 8 km an hour and the remaining at 10 km an hour. The total distance is:

Explanation:

Let the distance be x km.

Then, total time taken = $\frac{\frac{2 x}{3}}{8} + \frac{\frac{x}{3}}{10}$

$\Rightarrow (\frac{2 x}{3} \times \frac{1}{8}) + (\frac{x}{3} \times \frac{1}{10}) = \frac{21}{60}$

⇒ x = 3 kms.

Hence, option (d).

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