Subject: General Aptitude · Chapter: Time and Distance · Exam: 2008 · Marks: · Difficulty:
A long distance runner runs 9 laps of a 400 metres track everyday. His timings (in min) for four consecutive days are 88, 96, 89 and 87 respectively. On an average, how many metres/minute does the runner cover?
(a)17.78
(b)40
(c)90
(d)None of these
Answer
Answer (as printed): B
Explanation
Average speed $=\frac{\text { Total distance covered }}{\text { Total time taken }}$ $$\begin{aligned} & =\left(\frac{4 \times 9 \times 400}{88+96+89+87}\right) \mathrm{m} / \mathrm{min}=\left(\frac{14400}{360}\right) \mathrm{m} / \mathrm{min} \\ & =40 \mathrm{m} / \mathrm{min} . \end{aligned}$$