Question

Machine gun mounted on car is firing 30 bullets per minute onto the truck moving with speed 90 km/hr. The car is chasing truck with speed 180 km/hr. Numbers of bullet hitting the truck per min is ______. (Speed f bullet with respect to ground = 300 m/s)

पर्याय

• 11

• 22

• 33

• 44

Answer 1

Machine gun mounted on car is firing 30 bullets per minute onto the truck moving with speed 90 km/hr. The car is chasing truck with speed 180 km/hr. Numbers of bullet hitting the truck per min is 33. (Speed f bullet with respect to ground = 300 m/s)

Explanation:

Time between firing of two bullets = 2 sec

∴ Distance between two consecutive bullets = 500 m

∴ Time taken by one bullet getting into truck

just after a bullet hits the truck

t = `500/275` sec

∴ Bullet hitting the truck per sec

= `275/500xx60`

= 33