Question 1180038
Towns A and B are 300 km apart. Samuel travels from A to B at a speed of 80 km/h. 

Darius leaves 30 minutes after Samuel and also travels from A to B, at a speed of 100 km/h. Darius overtakes Samuel


When Dairus leaves Samuel is 40 km ahead of Darius. (After 1/2 hour)

The catchup distance is 40 km/h

Catch up speed is 100-80 = 20 km/h

Catch up time = catch up distance/ catch up speed

=40/20 = 2hours