A car moves at speed of 40 km/hr for 2 hrs then speed of 50 km/hr for next 3 hrs. Find the average speed of the car
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Answer:
a.
260
km
b.
43.3
km
hrs
=
12
m
s
Explanation:
a. In the 1st section, the car goes
40
km
h
r
⋅
2
h
r
s
=
80
km
In the 2nd section, the car goes
50
km
h
r
⋅
3
h
r
s
=
150
km
In the 3rd section, the car goes
30
km
h
r
⋅
1
h
r
s
=
30
km
The sum of those sections is
(
80
+
150
+
30
)
km
=
260
km
b.
Average speed
=
total distance
total time
. Total time in this problem is
6
hrs
, so
Average speed
=
260
k
m
6
hrs
=
43.3
km
hrs
Converting that to units of m/s:
43.3
k
m
h
r
s
⋅
1000
m
1
k
m
⋅
1
h
r
3600
s
=
12
m
s
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