A car covers 75 km of its journey at
60 km/hr, the next 45 km at a speed of 30km/hr and the remaining part of the journey in 2 firs and 15 min. If the aver-age speed for the journey was 45 km/hr, how much
distance was covered in the last part of the journey?
a) 100 km c) 80 km
b) 90 km d] 180 km
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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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