Question

Two cars A and B travel from one city to another, at speeds of 72 km/h and 90 km/h respectively. If car B takes 2 hours lesser than car A for the journey, then what is the distance (in km) between the two cities?
1. 600 km
2. 540 km
3. 520 km
4. 720 km

Answer 1

Correct Answer - Option 4 : 720 km

Given:

Speed of car A = 72 km/h 

Speed of car B = 90 km/h 

If car B takes 2 hours lesser than car A for the journey,

Formula used:

Time =Distance/Speed 

Calculations:

Let the distance between the two cities be x km.

According to the question,

(x/72) – (x/90) = 2

⇒ (5x – 4x)/360 = 2

⇒ x = 720 km

∴ The total distance between both the cities is 720 km