Discussion

Explanation:

Gautam covers 1 km at a speed of 10 km/h. 

So, he takes 6 minutes to cover the distance.

Varun will take (6 + 3), i.e. 9 minutes and Tarun will take 9 + 1 = 10 minutes to cover the same distance.

∴ Tarun's speed is 1/(10/60) km/h = 6 km/h.

Hence, option (d).

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