SAT数学Problem Solving练习题（21）
- 2017年07月25日14:38 来源：互联网
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以下是小站SAT频道为大家整理了SAT数学Problem Solving练习题(21)，供考生们参考，以下是详细内容。
Question 21: A bus travels from town A to town B for 2 hours at a speed of 60 miles/hour. The bus stops in town B for 2 hours and then travels from town B to town C for 1 hour, at a speed of 50 miles/hour. What is the average speed of the bus?
(a) 30miles/hour
(b) 31miles/hour
(c) 32miles/hour
(d) 34miles/hour
(e) 40miles/hour
Answer: The distance the bus travels from A to B is 60 miles/hour · 2 hours = 120 miles.
Then, the bus travels from B to C: 50 miles/hour · 1 hour = 50 miles.
The total distance traveled is 120 + 50 = 170 miles and the total time is 2 hours + 2 hours stop + 1 hour = 5 hours.
In conclusion the average speed was 170 miles / 5 hours = 34 miles/hour.
