单选题An amusement park ride has an elevator that brings riders to the top of a tower. Riders step off the elevator onto a straight slide, which leads from the top of the tower to level ground. The base of the slide is 400 feet from the base of the tower and the length of the slide is 500 feet. If the elevator rises at a rate of 10 feet per second, how many seconds does the elevator take to rise from the ground to the top of the slide?A30B40C50D150E300
单选题
An amusement park ride has an elevator that brings riders to the top of a tower. Riders step off the elevator onto a straight slide, which leads from the top of the tower to level ground. The base of the slide is 400 feet from the base of the tower and the length of the slide is 500 feet. If the elevator rises at a rate of 10 feet per second, how many seconds does the elevator take to rise from the ground to the top of the slide?
A
30
B
40
C
50
D
150
E
300
参考解析
解析：
因为塔，地面和滑梯形成一个直角三角形，根据勾股定理可以得出a2+(400)2＝(500)2，a=300，也就是滑梯的高，因为电梯的速度为每秒10英尺，所以10t=300，所以需要30秒的时间。
因为塔，地面和滑梯形成一个直角三角形，根据勾股定理可以得出a2+(400)2＝(500)2，a=300，也就是滑梯的高，因为电梯的速度为每秒10英尺，所以10t=300，所以需要30秒的时间。
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