Symbiosis National Aptitude Test SNAP 2019 Paper

Question : 38 of 110

Marks: +1, -0

Brigadier Rastogi travels from point A to B at 40 km/hr on bike. He travels from point B to C at 10 km/hr on cycle.
The distance from A to B is equal to that of B to C. Then he travels from C to A via B at 24 km/hr by autorickshaw.
Then find his average speed.

12.2 km/hr
12.4 km/hr
19.2 km/hr
19.4 km/hr

Validate

Solution:

Let distance from point A to B = Point B to C = d km.
Time to go from A to B =

d/{40}

hr.
Time to go from B to C =

d/{10}

hr.
Time to come from C to A via B =

{2d}/{24}

d/{12}

hr.
Average speed =

{4×d}/{d/{40}+d/{10}+d/{12}}

{4×120}/{3+12+10}

{4×120}/{25}

= 19.2 km/hr.

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