Consider there is an staircase elevator and you are coming down. If you walk 20 steps and stop, then you reach bottom in 10 minutes. If you walk 10 steps and stop, you reach to the ground in 20 minutes. What is the speed of the elevator?
Correct answer: A
Explanation
Let total number of steps in the elevator be n and let the speed be e
Elevator covered n-20 steps in 10 mins
(n-20)/e=10.................1
Elevator covered n-10 steps in 20 mins
(n-10)/e=20......................2
From (1) and (2)
n=30
e=1 step/min
Hence (A) is correct answer.
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AQuA-RAT items are crowdsourced algebra problems, not ACT questions. They carry five answer choices in the pre-2025 ACT Mathematics style and no ACT reporting category. Useful for drilling Preparing for Higher Math content; not a substitute for a real form.