Question

If I drive from Delhi to Mumbai at 40 km/hr and then from Delhi to Mumbai at 60 km/hr, what is my average speed for the whole journey?

Answer 1

Answer:

2,400

Explanation:

hope it will help you

Answer 2

Answer:

48 km/hr

Explanation:

Given :

Delhi to Mumbai at 40 km/hr

Mumbai to Delhi at 60 km/hr

To find :

Average speed of whole journey

Formula :

$Speed = \frac {distance}{time}\\\\Time = \frac {distance}{speed}$

Solution :

Let us assume the distance from Delhi to Mumbai (or) Mumbai to Delhi be 'x'

$Speed = \frac {2x}{( {\frac {x}{40}}) + (\frac {x}{60})} \\\\Speed = \frac{2x}{(\frac{100x}{2400})}\\\\Speed = \frac {2x \times 2400}{100x}\\\\Avg. \ Speed = 48km/hr\\\\\\\therefore \boxed {\textbf {Average Speed = 48 km/hr}}$

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