A motorcyclist covers half of the distance between two places at a speed of
30 km h- and the second half at the speed of 60 kmh-'. Compute the average
speed of the motorcycle.
dinotlı outh for the winter flies with a constant velocity of
Answers
Answered by
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Letx consider, x= total distance covered by the car,
Time taken to complete the half distance with velocity v=40km/h,
t
1
=
2×40
x
=
80
x
hr. . . . .(1)
The time taken to complete another half distance with velocity u=60km/h
t
2
=
2×60
x
=
120
x
hr
The total time taken, t=t
1
+t
2
t=
80
x
+
120
x
=
48
x
hr
The average speed of the car,
v
avg
=
x/48
x
=48km/h
The correct option is B.
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