A car travels at 40 km/h for the first third
of its journey, at 35 km/h for the second
third of its journey and at 42 km/h for the
final third of its journey. What is its average
speed? answer it correctly otherwise i will report....
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very eassy
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zaira777
08.03.2019
Physics
Secondary School
+5 pts
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A car travels at 40 km/h for the first third of its journey , 35 km /hfor the second third of its journey and 42 km/h for the final third of its journey. What is its average speed?
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jhasumit
jhasumit Ambitious
Speed(s)=distance(d)/time(t)
Let us assume the total distance travelled to be 3x.
So the car travels x distance with each speed.
Since, s=d/t,
t=d/s
So the total time taken would be
T=x/40 + x/50 + x/60
Total distance, D=3x
Avg speed = D/T = 3x/( x/40 + x/50 + x/60 )
Cancel x from numerator and denominator and solve for average speed.
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