A man rides at the rate of 18 km hr but stops for 6 minutes to change horses at the end of every 7t...........

Quant (SSC) Time & distance

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

6 hrs

6 hrs. 12 min.

6 hrs. 18 min.

6 hrs. 24 min.

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Explanation:

Number of stoppages
= 90 /7 = 12.8,
it means there is 12 stoppages.
Distance to be covered = 90 km, Speed = 18,
Time for each stoppage = 6 mins.
By the short trick approach, we get
= (90/18) + 12 x 6
= 5 hrs + 72 mins
Convert mins to hours then,
= 6 hrs 12 mins.