Distance  between them is 525m. i,e Eddie ran a further 525m than Faizal for the same period of time. We use the speed difference, i.e. 35m/min to calculate the distance difference and time.
Time taken = 525/35 = 15 min

Eddie speed = 145 m/min
Distance covered by Eddie =145 X 15 = 2175m

Faizal speed = 145 – 35 = 110 m/min
Distance covered by Faizal = 110 X 15 = 1650m

So distance between them is now = 2175 + 1650 = 3825m ###