Question

A car travelled the first half of its journey at 40 km/h and the next half at 60 km/h. Find the average speed of the car over the whole journey.

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Answer 1

Answer:

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Answer 2

Answer:

Let D denotes the total distance (in km) traveled by P.

According to the given data we have,

Time (in hrs.) for 1st-half of the journey = (D/2) / 40 = D/80

Time (in hrs.) for 2nd-half of the journey = (D/2) / 50 = D/100

Hence average speed = (total distance) / (total time)

= D / [(D/80) + (D/100)] = 20/[(1/4) + (1/5)] = 400/9 = 44.44 (km/hr) [Ans]

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Step-by-step explanation:

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