Subject: General Aptitude · Chapter: Time and Distance · Exam: · Marks: · Difficulty:
With a uniform speed a car covers the distance in 8 hours. Had the speed been increased by 4 km/hr, the same distance could have been covered in $7 \frac{1}{2}$ hours. What is the distance covered?
(a)420 km
(b)480 km
(c)640 km
(d)Cannot be determined
(e)None of these
Answer
Answer (as printed): B
Explanation
Let the distance be $x \mathrm{km}$. Then, $\frac{x}{7 \frac{1}{2}}-\frac{x}{8}=4 \Leftrightarrow \frac{2 x}{15}-\frac{x}{8}=4 \Leftrightarrow x=480 \mathrm{km}$.