A vehicle covers certain distance at constant speed of 20 km/h in time interval
‘t’ on linear path. Then it covers certain distance at constant speed of 30 km/
h in the same time interval what is the average speed of the vehicle ?
(a) 25 km/h (b) 24 km/h (c) 50 km/h (d) 12 km/h
Answers
Answered by
1
Answer:
Velocity for one third of distance V
1
=20km/h
Velocity for two third of distance V
2
=60km/h
Time take to cover one third of distance t
1
=
V
1
d/3
=
20
d/3
Time taken to cover two third of distance t
2
=
V
2
2d/3
=
60
2d/3
Average velocity =
totaltime
Totaldistance
V
av
=
t
1
+t
2
d
=
20
d/3
+
60
2d/3
d
=36km/h
Answered by
2
Explanation:
Let distance from A to B be x
Time for travel from A to B= x/20
Time for travel from B to A= x/30
Hence,speed for total distance 2x is:
30
x
+
20
x
2x
=
5x
2x×60=
24 km\hr
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