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.
The answer is 88 4/5 but I can't seem to get it. Help would be highly appreciated :)
Answers
Answered by
7
Answer:
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.
Answered by
3
wer:
The answer is 0.833 km/ h
Time taken to the first 19 km of its journey
= 19
57
= 0.33
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