A car travels the first 19 km of its journey at
an average speed of 57 km/h and the remaining
55 km at an average speed of 110 km/h. Find the
average speed of the car for its entire journey,
Answers
What is the average speed of car for it's entire journey if it travels the first 19km of it's journey at an average speed of 57km/h and remaining 55km at an average speed of 110km/h?
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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 mph
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 mph