ABC26GN3663 · Time and Distance

Subject: General Aptitude · Chapter: Time and Distance · Exam: 2008 · Marks: · Difficulty:

A man on tour travels 160 km by car at 64 km/ hr and another 160 km by bus at 80 km/hr. The average speed for the whole journey is

(a)35.55 km/hr

(b)36 km/hr

(c)71.11 km/hr

(d)71 km/hr

Answer

Answer (as printed): C

Explanation

Total time taken $=\left(\frac{160}{64}+\frac{160}{80}\right) \mathrm{hrs}=\frac{9}{2} \mathrm{hrs}$. $$\text { ∴ Average speed }=\left(320 \times \frac{2}{9}\right) \mathrm{km} / \mathrm{hr}=71.11 \mathrm{km} / \mathrm{hr} .$$

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