Question

Ram travels at a speed of 20 km/hr while going to school. While coming back, he travels at a speed of 30 km/hr(due to less traffic). What his it’s average speed?

Answer 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

Answer 2

Let us assume that Ram 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