waec model questions vol1 2023 mathematics
Objective • Question 6
Question 6
WAEC_MODEL_QUESTIONS_VOL1
•
2023
The time T (in minutes) taken to fill a tank varies directly as the square of the radius r (in cm) of the inlet pipe and inversely as the speed v (in cm min⁻¹) of water flow. When r = 4 cm and v = 6 cm min⁻¹, the tank is filled in 5 minutes. If the radius is increased to 5 cm and the required filling time is 3 minutes, what speed of water flow (in cm min⁻¹) is needed?
Answer Options
A.
135/8
B.
25/4
Correct Answer
C.
125/8
D.
15/2
Correct Answer
C
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