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