Question 53

To make a certain journey, a distance of 10 km is travelled on foot in 3 hours, a distance of 120 km is travelled by car in 3 hours, and a distance of 70 km is travelled by scooter in 4 hours. What is the average speed (in km/h) of the total journey?

Solution

average speed of the total journey = $$\frac{total\ dis\tan ce}{total\ time}$$

= $$\frac{10+120+70}{3+3+4}$$

= $$\frac{200}{10}$$

= 20 km/h


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