## A car travels the first 19 km of its journey at an average speed of 57km/h and the remaining 55 km at an average of 110 km/h. Find the avera

Question

A car travels the first 19 km of its journey at an average speed of 57km/h and the remaining 55 km at an average of 110 km/h. Find the average speed of the car for it’s entire journey.

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2 weeks 2021-09-10T20:55:15+00:00 2 Answers 0 views 0

55m/h

Step-by-step explanation:

At 57km/h, to drive 19km takes 19/57 = 1/3 hour (or 20 minutes).

At 110km/h, to drive 55km takes 55/110 = 1/2 hour (or 30 minutes).

Since it takes 5/6 hour (or 50 minutes) to drive the 19+55 = 74 km,

the average speed is: 74 / (5/6) = 74 * (6/5) = 88.8 km /h.

Alternatively: 74 km / 50 minutes = 1.48 km/minute

= 1.48 km/minute * 60 minutes/ 1 hour = 1.48 * 60 km/h = 88.8 km /h

= 1.48 km/minute * 1 minute / 60 seconds = 24.6666… m/s

= 55 m/h.

Hope it helps:)

55m/h

Step-by-step explanation:

At 57km/h, to drive 19km takes 19/57 = 1/3 hour (or 20 minutes).

At 110km/h, to drive 55km takes 55/110 = 1/2 hour (or 30 minutes).

Since it takes 5/6 hour (or 50 minutes) to drive the 19+55 = 74 km,

the average speed is: 74 / (5/6) = 74 * (6/5) = 88.8 km /h.

Alternatively: 74 km / 50 minutes = 1.48 km/minute

= 1.48 km/minute * 60 minutes/ 1 hour = 1.48 * 60 km/h = 88.8 km /h

= 1.48 km/minute * 1 minute / 60 seconds = 24.6666… m/s

~= 55 m/h

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