3. A car travels a certain distance with 42 km h-1 for
20 minutes and the remaining distance at 60 km
h-1 for 30 minutes. What is its average speed of the
whole journey
Answers
Answered by
1
Answer:
Let the total distance travelled be x km Then total time taken =
10
x/3
+
20
x/3
+
60
x/3
=
30
x
+
60
x
+
180
x
=
180
6x+3x+x
=
180
10x
=
18
x
hrs Then average speed = =
Totaltimetaken
Totaldistancetravelled
=
x/18
x
km/hr = 18 km/hr
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