Question 588210
cycling speed = 12 km/h
jogging speed = 8km/h

distance = 5 km

difference in time taken =

5/8 - 5/12

LCD =24
(15-10)/24 = 3/24 = 1/8 hours more

In 1/8 hours he will jog 1/8 * 8 = 1 km

Head start = 1km