Answer :
Explanation:
Explanation:
As per the provided information in the given question, we have :
A car travels first 50 km at a uniform speed of 25 km/h.
And, next 60 km at a speed of 20 km/hr.
We are asked to calculate the average speed of the car.
⟼
(
)
=
⟼Speed
(avg)
=
Totaltime
Totaldistance
Calculating total distance :
⟼
D
i
s
t
a
n
c
e
(
T
o
t
a
l
)
=
D
i
s
t
a
n
c
e
(
A
B
)
+
D
i
s
t
a
n
c
e
(
B
C
)
⟼Distance
(Total)
=Distance
(AB)
+Distance
(BC)
⟼
D
i
s
t
a
n
c
e
(
T
o
t
a
l
)
=
50
k
m
+
60
k
m
⟼Distance
(Total)
=50km+60km
⟼
(
)
=
110
⟼Distance
(Total)
=110km
∴ Total distance travelled is 110 km.
\rule{200}2
Calculating total time :
⟼
T
i
m
e
(
T
o
t
a
l
)
=
T
i
m
e
(
A
B
)
+
T
i
m
e
(
B
C
)
⟼Time
(Total)
=Time
(AB)
+Time
(BC)
Time = Distance/Speed
⟼
T
i
m
e
(
T
o
t
a
l
)
=
D
i
s
t
a
n
c
e
(
A
B
)
S
p
e
e
d
(
A
B
)
+
D
i
s
t
a
n
c
e
(
B
C
)
S
p
e
e
d
(
B
C
)
⟼Time
(Total)
=
Speed
(AB)
Distance
(AB)
+
Speed
(BC)
Distance
(BC)
⟼
T
i
m
e
(
T
o
t
a
l
)
=
(
50
25
+
60
20
)
h
⟼Time
(Total)
=(
25
50
+
20
60
)h
⟼
T
i
m
e
(
T
o
t
a
l
)
=
(
2
+
3
)
h
⟼Time
(Total)
=(2+3)h
⟼
(
)
=
5
ℎ
⟼Time
(Total)
=5h
∴ Total time taken is 5 hours.
\rule{200}2
Calculating average speed :
⟼
S
p
e
e
d
(
a
v
g
)
=
T
o
t
a
l
d
i
s
t
a
n
c
e
T
o
t
a
l
t
i
m
e
⟼Speed
(avg)
=
Totaltime
Totaldistance
⟼
S
p
e
e
d
(
a
v
g
)
=
110
k
m
5
h
⟼Speed
(avg)
=
5h
110km
⟼
(
)
=
22
ℎ
−
1
⟼Speed
(avg)
=22kmh
−1
∴ Average speed of the car is 22 km/h.