car covers 1/3 rd of its journey with 40 km/h and 1/6 th of journey with a speed of 80 kmph and rest with a speed of 100 km/h then it's average speed is
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Answer:
Explanation:
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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