When will two objects moving in the same direction meet?

Question

A super tanker is travelling at 15miles/hour in a straight line. Assume that the tanker is heading directly at an iceberg that is drifting at 5miles/hour in the same direction that the tanker is going. If the two are 1.16667miles apart, how long will it take the two to meet?

Answer 1

20 miles/h    d/rate=time

5/3/20=1/12 hour  5 minutes

Answer 2

The tanker is closing the distance between itself and the iceberg at a rate of 10 mph (15-5).

At that rate the 1.6667 mile gap will disappear in 0.16667 hours (1.6667/10).

0.16667 hours = 0 hours, 10 minutes, 0.012 seconds.