A man is walking at a speed of 12 km per hour. After every kilometre, he takes rest for 4 minutes. How much time(in minutes) will he take to cover a distance of 8 kilometres?

68

According to the question,

Time taken to cover 1 km distance = \(\frac{Distance}{Speed}\)

 Time = \(\frac{12}{60}\)

= 5 min.

Including rest time, time taken to cover 1 km distance = (5 + 4)min = 9 min.

Time taken to cover 7 km distance = (7 × 9) min. = 63 min.

Time taken to cover next 1 km = 5 min

So ,   time taken to cover 8 km distance = (63 + 5) min.

= 63 + 5 = 68 minutes