Two cars A and B travel from one city to another city, at speed of 72 km/hr and 90 km/hr respectively. If car B takes 1 hour lesser than car A for the journey, then what is the distance (in km) between the two cities?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 360
Distance = speed × time
Time taken by B is 't' hours
72(t + 1) = 90t
72t + 72 = 90t
72 = 18t
t = 4 hrs
Distance = 90 × 4 = 360 km