The average distance across an ocean is 16,000 km. two continents on either side of the ocean are con-verging at a rate of 10 cm/year. how long will it take for them to collide?

The average distance is 16,000 km
Converging rate is  10 cm/year
1 km = 100,000 cm
 = 16,000 × 100,000/10 cm/year
= 160,000,000 years
It will then take 160 Million years to collide.

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