A body covers a distance in such a way that half the time with a velocity of 60kmph and the remaining time with a velocity of 40kmph. The average velocity is
3 points
A.50
B.20
C.30
D.40
Answers
Answered by
0
Answer:
40
Explanation:
Speed of the car in the first half, v
1
=40 kmph
Speed of the car in the second half, v
2
=40 kmph
Let the distance travelled by the car, d=2x
We know,
speed(v)=
time(t)
distance(d)
⇒t=
v
d
Time taken to travel the first half, t
1
=
40
x
hours
Time taken to travel the remaining half, t
2
=
60
x
hours
Total time taken, t=t
1
+t
2
t=
40
x
+
60
x
hours
average speed, v
avg
=
total time
total distance
=
40
x
+
60
x
2x
v
avg
=
3x+2x
2x×120
v
avg
=
5
240
v
avg
=40 kmph
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