A car travels the first 30 km of its journey at an average speed of 40 km/hr and the
remaining 40 km at an average speed of 80 km/hr. Find the average speed of the
car for its entire journey.
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Step-by-step explanation:
speed = distance/time
t1, time taken for first 30km =
40 = 30 /t1
t1=3/4
t2, time taken for next 40km=
80 = 40/t2
t2 =40/80=1/2
total distance = 30+40=70
total time = 3/4 +1/2= 1 1/4=1.25
average speed = 70/1.25 = (70/ 5)×4 = 14×4=56kmph
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