ABC26GN3654 · Time and Distance

Subject: General Aptitude · Chapter: Time and Distance · Exam: 2009 · Marks: · Difficulty:

An aeroplane flies from place A to place B at the speed of 500 km/hr. On the return journey, its speed is 700 km/hr. The average speed of the aeroplane for the entire journey is

(a)$566 \frac{2}{3} \mathrm{km} / \mathrm{hr}$

(b)$583 \frac{1}{3} \mathrm{km} / \mathrm{hr}$

(c)$583 \frac{2}{3} \mathrm{km} / \mathrm{hr}$

(d)600 km/hr

Answer

Answer (as printed): B

Explanation

Average speed $=\left(\frac{2 \times 500 \times 700}{500+700}\right) \mathrm{km} / \mathrm{hr}=\left(\frac{1750}{3}\right) \mathrm{km} / \mathrm{hr}=583 \frac{1}{3} \mathrm{km} / \mathrm{hr}$.

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