Question 30
Captain Robin’s ship springs a leak 150 km from port. Every 6 minutes, 2 tonnes of water enter. The ship sinks when 90 tonnes of water are aboard. A pump removes 5 tonnes per hour. What is the slowest speed that gets it to port before it has sunk?
Editorial consistency task: retain the question and options, then compare the source boundary answer with the strict “not yet sunk” condition. Explain which conclusions are valid.
Original choices retained / Các lựa chọn gốc được giữ lại:
(A) 24km/h; (B) 16km/h; (C) 18km/h; (D) 22km/h; (E) 25km/h
Editorial consistency task: retain the question and options, then compare the source boundary answer with the strict “not yet sunk” condition. Explain which conclusions are valid.
Original choices retained / Các lựa chọn gốc được giữ lại:
(A) 24km/h; (B) 16km/h; (C) 18km/h; (D) 22km/h; (E) 25km/h