Special relativity question, help !!!?

Suppose you are standing still on an infinitely flat stationary ground and your friend is travelling in a spaceship at 98% speed of light horizontally according to you. Your friend has a stopwatch and he starts the stopwatch at the instant when he zooms past you. After a while your friend stops his spaceship instantly. At the same time, he notes down the time interval registered on his stopwatch. If the distance between you and his spaceship (after it stops) is 1477.4 km, what is the time interval noted down by your friend on his stopwatch?