KVPY SA Exam 05-Nov-2017 Question Paper

Question : 18 of 80

Marks: +1, -0

A person goes from point P to point Q covergin 1/3 of the distance with speed 10km/hr, the next 1/3 of the distance at 20 km/hr and the last 1/3 of the distance at 60 km/hr. The average speed of the person is

30 km/hr
24 km/hr
18 km/hr
12 km/hr

Validate

Solution:

V_\avg={\Total \Distance}/{\total \time}

=S/{{S\/3}/10+{S\/3}/20+{S\/3}/60}

V_\avg=18

km/hr

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