Question

A planet moving at a rate of 3 cm/year is moving toward a planet that is 1,500 km away in how many years will the planet collide

Answer 1

Answer: $5\times 10^7\ \text{years}$

Explanation:

Given

A Planet is moving at a rate of 3 cm/year

distance between planets is 1500 km

and 1 km=1000 m

1 m=100 cm

No. of years required to cover 1500 km=$\dfrac{1500\times 1000\times 100}{3}=5\times 10^7\ \text{years}$