Intial Speed of truck = 120 km/hr
Order of successive Reduction of speed : 10 , 12, 14, 16, 18, 20 , 22, 24 km/hr
Speed after each succesive reduction :
= 120-10, 120-(10+12), 120-(10+12+14), .... km/hr
= 110, 98, 84, 68, 50, 30, 8, - 16 km/hr
From the above we can conclude that after 7th reduction in speed, speed of truck becomes 8 km/hr
In 8th step, there is maximum possible reduction in speed is 24 km/hr. So, after 8km/hr reduction in 8th step truck will stop.
So, in the 160 m truck will definately stop .
GOLDEN POINT :(-16 km/hr) symbolise that if intial spped of truck is 136km/hr than also truck will stop but if speed exceds 136km than truck will not stop within 160 m