Victor left his house riding his bike at a speed of 18 km/h. When Victor was km away from his house his brother Alex left the house riding at a rate of 24 km/h. How long will it take Alex to catch up with Victor?

Complete question :

Victor left his house riding his bike at a speed of 18 km/h. When Victor was 1/2 km away from his house his brother Alex left the house riding at a rate of 24 km/h. How long will it take Alex to catch up with Victor?

0.083333 or 5 minutes

Step-by-step explanation:

Victor's speed = 18 km/hr

Alex's speed = 24 km/hr

Alex left after Victor has moved a distance of 1/2 km

Time Alex will catch up with Victor :

Let time = x

distance at which Victor = Alex

(18 * x) + 0.5 = (24 * x)

18x + 0.5 = 24x

18x - 24x = - 0.5

-6x = - 0.5

x = 0.5 / 6

x = 0.0833333 hour

x = 0.0833333 *60 = 5 minutes