NIMCET 2020 Question Paper with solutions

Question : 8 of 120

Marks: +1, -0

Three cities A, B, C are equidistant from each other. A motorist travels from A to B at 30km/hour, from B to C at 40km/hour and from C to A at 50km/hour. Then the average speed is

39km/hour
40km/hour
38.3km/hour
37.6km/hour

Validate

Solution:

Total distance

=3x(\let)S_{OA}=30,S_{OB}=40,S_{OC}=50

D_{OA}=x,D_{OB}=x,D_{OC}=x

∴ Speed = total distance /total time

={3x}/{x/30+x/40+x/50}=3/{{20+15+12}/600}

=1800/47=38.3km{/}h

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