1.

a person travelled from bangalore to chennai and found his average speed to be 60 km/hr. for the return journey to bangalore he travelled at night and found average speed to be 90km/hr. what is the average speed for the complete round trip?

Answer»

A person travelled from Banglore to Chennai and found his AVERAGE SPEED to be 60 km/h
Let V_1=60km/h

for the return journey from Chennai to Banglore , he travelled at night and found his average speed to be 90 km/h
Let V_2=90km/h

use the formula,
V_{average}=\frac{2V_1V_2}{V_1+V_2}\\\\=\frac{2\times60\times90}{60+90}\\\\=\frac{120\times90}{150}=72km/h

HENCE, average speed for the complete round TRIP is 72 km/h



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