A vehicle covers half of the total distance at a constant speed of 40 km/h & the remaining half at the constant speed of 60
km/h. what is the average speed
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Correct option is
C
48
Let the distance be 2x
Time taken to travel the first half =
40
x
hours
Time taken to travel the remaining half =
60
x
hours
Total time taken =
40
x
+
60
x
hours
Total distance = 2x
So average speed =
total time
total distance
=
40
x
+
60
x
2x
Clearly x gets cancelled and average speed =48 km/hr
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