a train travels 70 feet in 1/10 second.At this s
问题描述：
a train travels 70 feet in 1/10 second.At this s
a train travels 70 feet in 1/10 second.
At this same speed,how many feet will it travel in 3 1/2 seconds?
答
1 , a train travels70feet in 1/10 second,
so we can draw a conclusion that the speed is 700 feet /second,
2. so 3 1/2 seconds the train can travel700X 3 1/2 =2450 feet