3) A car covers the 1st half of the distance between two places at a speed of 40 km/hr and the second
at 60 km/hr. The average speed of the car is
a) 100 km/hr
b) 48 km/hr
c) 50 km/hr
d) 25 km/hr
Answers
Answered by
0
Answer:
50 km/hr
Explanation:
Average is total/no.of parts
Add the two speed and divide by two.
60 +40 = 100
100/2 = 50 km/ph
Answered by
4
Explanation:
Let us consider the total distance travelled by car be x
Time taken to complete the first half distance
t1 = x / (2×40) = x / 80 hour
Now... time taken to complete the second half
t2 = x / (2×60) = x / 120 hour
Therefore, total time taken
t = t1 + t2 = x / 80 + x / 120
= x / 48 hour
And as we know that speed is distance : time
So, Avg speed = x / (x/48)
= 48 km/hr
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