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- i:$distance:100*random+100
- i:$rate:50*random+10
- q:Two trains are $distance miles apart to begin, and are moving toward
- q:each other at $rate miles per hour. In how many hours will they collide?
- a:$distance / $rate
- e1:1
- e21:After one hour they will have travelled $rate miles.
- e22:After one hour they will be $distance - $rate miles apart.
- h:Each hour they close the distance between themselves by $rate miles.
- h:After one hour their separation is $distance - $rate.
- h:After two hours, their separation is $distance - 2 x $rate, etc..
- End of question
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