Kali left school and traveled toward her friends house at an

Kali left school and traveled toward her
friend\'s house at an average speed of 40
km/h. Matt left one hour later and traveled
in the opposite direction with an average
speed of 50 km/h. Find the number of hours
Matt needs to travel before they are 400 km
apart.

Solution

40T+50(T-1)=400
40T+50T-50=400
90T=400+50
90T=450
T=450/90
T=5 HOURS AFTER KALI LEAVE THEY WILL BE 400 km. APART.
5-1=4 HOURS AFTER MATT LEAVES THEY WILL BE 400 km. APART.