Question 23

A man rides at the rate of 18 km/hr, but stops for 6 mins. to change horses at the end of every 7th km. The time that he will take to cover a distance of 90 km is

Solution

Speed of man = 18 km/h

Total distance = 90 km

As he stops after 7th km, => $$90=(12\times7)+6$$

=> He stops 12 times in the journey.

Total stoppage time = $$12\times6=72$$ min

Real time = $$\frac{90}{18}=5$$ hours

$$\therefore$$ Required time taken = 5hr + 72 min

= 6 hrs 12 min

=> Ans - (B)

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