Question

20 Ex. 5. A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. Find the average speed for the first 320 km. 160 5 Sol. Time taken to cover first 160 km hr hr 64 2 160
in this how to convert 2 h in fraction
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Answer 1

Answer:

The average speed for the first 320 km of the tour is equal to the distance traveled divided by the total elapsed time. The elapsed time for the first portion of the tour is 160 km / 64 km/h = 2.5 hours and the elapsed time for the second portion of the tour is 160 km / 80 km/h = 2 hours. The total elapsed time is 4.5 hours.

Solving for the average speed for the whole tour

Avg speed = total distance traveled / total elapsed time

Avg speed = 320 km / 4.6 h

Avg speed = 71.1 km/h

The average speed for the first 320 km of the tour is 71.1 km/h.