SAT数学Problem Solving练习题（21）

>>SAT考试：SAT数学Problem Solving练习题（21）

>>SAT考试辅导：精品课程高端指导

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.

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