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25-02-2022
Mathematics

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a motorist travels 2 hours at an average speed of 120km/h.He then travels 2.5 hours at an average speed of 102km/h. Calculate the average speed through out the journey

Respuesta :

27-02-2022

The motorist travel 2 hours at a speed of 120km/h -> In 2 hours, he/she travel : 120 x 2 = 240km

The next 2.5 hours, the motorist travel at 102km/h -> In 2.5 hours, he/she travel : 102 x 2.5 = 255km

So, he/she travel 255 + 240 = 495km in 4.5 hours

-> His/her average speed is : 495 : 4.5 = 110km/h.

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