An aeroplane flies along the four sides of a square at the speeds of 200, 400, 600 and 800km/hr. Find the average speed of the plane around the field?
Correct answer: A
Explanation
Let the each side of the square is x km
average speed of plane is y km/hr
(x/200)+(x/400)+(x/600)+(x/800) = 4x/y
25x/2400 = 4x/y
y= 384 km/hr
Answer is A
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Source: Algebra word problems from the AQuA-RAT dataset (Ling et al., 2017), published by Google DeepMind under the Apache License 2.0.
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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.