A person travels from city P to city Q. If he travels at a speed of 60 km/h, he arrives 1 hour early. If he travels at a speed of 40 km/h, he arrives 1 hour late. What is the distance (in km) between city P and city Q?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 240 km.
Let the distance = d km
So, d/40 - d/60 = 2
⇒ d/120 = 2
⇒ d = 2 × 120 = 240 km