A person covers a distance 'd' km from 'A' to 'B' with 20 km /h and returns through the same path from 'B' to 'A' with 30 km/h.The average speed of person's trip
25km/h
24km/h
20km/h
30km/h
Answers
Answered by
1
Answer:
Let us assume that Abdul is travelling x kilometer distance while going to school.
Distance = Speed x Time
1)When it's average speed is 20 km/hr
x=v
1
×t
1
=20×t
1
2)When it's average speed is 30 km/hr
x=v
2
×t
2
=30×t
2
V
average
=
totaltimetaken
totaldistancetravelled
V
average
=
v
1
x
+
v
2
x
x+x
=
20
x
+
30
x
2x
=24 km h
−1
Answered by
0
Answer:
Answer
Correct option is
B
24kmh
−1
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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