Question

which is faster: drive a car at a rate of 40 kilometers per hour or drive a car at a rate of 15 meters per second

Answer 1

15 meters per second is equivalent to 54 kilometres per hour.

Answer 2

Explanation:

Let's convert one of these measurements so that both measurements have the same units. 15 m/sec is equivalent to 0.015 km/sec, which in turn is equivalent to

0.015 km 3600 sec

--------- -------- ----------------- = 54 km/hr

1 sec 1 hr

This latter result (54 km/hr) is faster than (40 km/hr).