Question 75
Two cities, Delhi and Jaipur, are 360 km apart. A car goes from Delhi to Jaipur at a speed of 80 km/h and returns to Delhi from Jaipur using the same route at a speed of 120 km/h. What is the average speed of the car?
Solution
average speed of the car = $$\frac{2\times\ speed\ of\ the\ car\ while\ going\ \times\ speed\ of\ the\ car\ while\ coming \ back}{speed\ of\ the\ car\ while\ going\ +\ speed\ of\ the\ car\ while\ coming\ back}$$
= $$\frac{2\times120\times80}{120+80}$$
= $$\frac{2\times120\times80}{200}$$
= $$1\times12\times8$$
= 96 km/h
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