Discussion
Two cars cover the same distance at the speed of 60 and 64 kmps respectively. Find the distance traveled by them if the slower car takes 1 hour more than the faster car.
Answer: C
The slower car takes one hour longer over the same distance.
\[ \frac{d}{60} - \frac{d}{64} = 1 \]
\[ d\left(\frac{64 - 60}{3840}\right) = 1 \quad\Longrightarrow\quad \frac{4d}{3840} = 1 \]
\[ d = 960 \text{ km} \]
The unit matters: the answer is in kilometres, since the speeds were given in kmph.
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