Q: Which of the following statements about time, speed and distance unit conversion are correct?
(A) In time–speed–distance problems, distance is calculated as speed multiplied by time;
(B) When speed is given in km/h and time in minutes, the time should be converted into hours before multiplication;
(C) To convert a speed from metres per second (m/s) to kilometres per hour (km/h), we multiply by 18/5;
(D) To convert a speed from kilometres per hour (km/h) to metres per second (m/s), we multiply by 5/18;
(E) Unit conversions are unnecessary if the final answer can be approximated mentally;
Choose the correct answer from the options given below:

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