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UPSC 2016 CDS II Math Paper
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© examsnet.com
Question : 99
Total: 100
A motorist travels to a place 150 km away at an average speed of 50 km/hour and returns at 30 km/hour. What is the average speed for the whole journey ?
[2016 CDS-II]
35 km/hour
37 km/hour
37.5 km/hour
40 km/hour
Validate
Solution:
Total distance travelled in whole journey = 150 + 150 = 300 km
Total time for the whole journey
=
150
50
+
150
30
=
8
hours
(
∵
Time
=
Distance
Speed
)
∴ Average speed for the whole journey
=
Total distance travelled in whole journey
Total time for the whole journey
=
300
8
=
37.5
km/hour
© examsnet.com
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