Question

Why do we multiply a given value of speed with 18/5 to convert m/s to km/h?

Answer 1

Step-by-step explanation:

1000 meter = 1 kilometer

3600 second = 1 hour

1000 meter / 3600 second = 1 kilometer / 1 hour

5 meter / 18 second = 1 kilometer / 1 hour

1 meter / 1 second = (18/5) (1 kilometer / 1 hour)

Answer 2

Answer:

Because to convert from metres / sec to kilometres per hour, we multiply the metres per second by 3,600 to get to metres per hour, and divide the product by 1,000 to get from metres per hour to kilometres per hour, so, overall, that’s a factor of 3,600/1000 which simplifies to 18/5. Using 18/5 is great for mental arithmetic. Multiply by 3.6 if you can handle that mentally…

Step-by-step explanation:

1000m =1km

3600 sec = 1 hr