Answer:
B Sorry if it's late
36 minutes.
Explanation:
The distance he travels is 4 + 5 + 6 = 15 km.
As his speed is 25km /hour, by proportion, the time taken to complete the journey
= (15/25) * 60 ( Note: 1 hour = 60 minutes.)
= 0.6 * 60
= 36 minutes.
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