What is the formula to calculate time if distance and speed are known?

What is the formula to calculate time if distance and speed are known?

• A. Speed Times Distance
• B. Distance Times Speed
• C. Speed Divided By Distance
• D. Distance Divided By Speed

Answer: (D)

Time is found by dividing distance by speed. Speed tells you how far you go each unit of time, so distance equals speed times time. If you solve that for time, you get time = distance ÷ speed. For example, going 100 kilometers at 50 kilometers per hour takes 2 hours, because 100 ÷ 50 = 2. The other ways of combining distance and speed don’t give time: multiplying would produce a quantity with the wrong units, and dividing speed by distance would describe time per distance, not total time.

Time is found by dividing distance by speed. Speed tells you how far you go each unit of time, so distance equals speed times time. If you solve that for time, you get time = distance ÷ speed. For example, going 100 kilometers at 50 kilometers per hour takes 2 hours, because 100 ÷ 50 = 2. The other ways of combining distance and speed don’t give time: multiplying would produce a quantity with the wrong units, and dividing speed by distance would describe time per distance, not total time.