1.

A girl goes by a car 150 km in 10 hours and comes back in 5 hours. Find the average speed of the car1. 30 km/h2. 50 km/h3. 20 km/h4. 40 km/h5. 10 km/h

Answer» Correct Answer - Option 3 : 20 km/h

Given:

Distance she goes by car = 150 km

Distance she comes back by car = 150 km

Time taken by her in going = 10 hours

Time taken by her in coming back = 5 hours

Formula Used: 

Average Speed = Total distance/Total time

Calculation: 

Total distance covered by her = Distance she goes by car + Distance she comes back by car

Total Distance = 150 + 150 = 300 km

Total time = Time taken by her in going + Time taken by her in coming back

Total time = 10 + 5 = 15 hours

Average Speed of car = 300/15 = 20 Km/h

∴ The Average Speed of the car is 20 km/h.

 


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