Question
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
Answer: Option B
Answer: (b)90 km = 12 × 7km + 6 km.To cover 7 km total time taken = $7/18$ hours + 6 min. = $88/3$ min.So, (12 × 7 km) would be covered in $(12 × 88/3)$ min.and remaining 6km is $6/18$ hrs or 20 min.Total time = $1056/3$ + 20= $1116/{3 × 60}$ hours = 6$1/5$ hours= 6 hours 12 minutes.
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Answer: (b)90 km = 12 × 7km + 6 km.To cover 7 km total time taken = $7/18$ hours + 6 min. = $88/3$ min.So, (12 × 7 km) would be covered in $(12 × 88/3)$ min.and remaining 6km is $6/18$ hrs or 20 min.Total time = $1056/3$ + 20= $1116/{3 × 60}$ hours = 6$1/5$ hours= 6 hours 12 minutes.
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