Question 64
Om Prakash travels Bombay to Pune at a speed of 80 km/hr and returns back to Bombay by increasing his speed by 50%, then his average speed for the whole journey is .............
Solution
Om Prakash travels Bombay to Pune at a speed of 80 km/hr
He returns back to Bombay by increasing his speed by 50% $$=1.5\times 80 = 120$$
his average speed for the whole journey is $$ = \frac{2(V_1 \times V_2)}{V_1 + V_2} $$
$$=\frac{2(80\times120)}{80+120} = 96 kmph$$
Option A is correct.
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