Explanation


Explanatory Answer

In the first 10 minutes he travels 60 x 10/60 = 10 km

In the second 10 minutes he travels 54 x 10/60 = 9 km

And 8 km, 7 km, 6km …. In the subsequent 10 minutes

10 + 9 + 8 + 7 + 6 = 40 km

The remaining 2 minutes at (60 – 5 x 6) = 30kmph

So time = 2/30 = 1/15 hr = 4 minutes

So total time for 42 km = 5 x 10 + 4 = 54 minutes.

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