ABC26GN3655 · Time and Distance

Subject: General Aptitude · Chapter: Time and Distance · Exam: 2007 · Marks: · Difficulty:

A car covers a distance from Town I to Town II at the speed of 56 km/hr and from Town II to Town I at the speed of 53 km/hr. What is the average speed of the car?

(a)53.5 km/hr

(b)54 km/hr

(c)55 km/hr

(d)55.5 km/hr

(e)None of these

Answer

Answer (as printed): E

Explanation

$$\begin{aligned} \text { Average speed } & =\left(\frac{2 \times 56 \times 53}{56+53}\right) \mathrm{km} / \mathrm{hr}=\left(\frac{5936}{109}\right) \mathrm{km} / \mathrm{hr} \\ & =54.45 \mathrm{km} / \mathrm{hr} \approx 54.5 \mathrm{km} / \mathrm{hr} . \end{aligned}$$

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