This is a maths question I need to have completed today, but I don't know how to do it!

"What is the probability that you will get hit by a fragment of a hand grenade assuming you stand 3 meters from the explosion?"

"Assume that the grenade weights 600 grams"

"Assume that the explosive inside weights 60 grams"

"Assume that each fragment will weights 2 grams"

Using only this data, how can I solve this problem?