On a 120 km road, a car travels the
first 30 km at a uniform speed of 30 kmh. How
fast must the car travel for the rest of track so
as to have an average speed of 60 km h-' for the
entire journey?
[HOTSI
Answers
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7
Answer:
90 km/h for remaining hours
Explanation:
average speed for whole journey
=60km/h
t1=1 hour
s1= 30 km/h
120/x=60 km/h
therefore
time taken for whole journey = 2 hours
so the remaining time is 1 hour
60= 30+y/2
( as A.S= total distance /total time )
120= 30+y
90=y
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