Question

A car is traveling at a speed of 38.0 m/s on an interstate highway where the speed limit is 75.0 mi/h. Is the driver exceeding the speed limit?

Answer 1

Driver is exceeding the speed limit and is driving at `85` miles per hour.

Explanation:

As car travels `38` meters in each second,

in one hour or `3600` seconds, it travels `38xx3600=136800m`.

Now each mile has `1609.34` meters.

So in one hour car travels `136800/1609.34=85` miles

As `85` miles per hour is well beyond the speed limit of `75` miles per hour

Driver is exceeding the speed limit.

Answer 2

Yes, the car is travelling at 85.5 mph.

Explanation:

There is 1600 metres in a mile, and there are 3600 seconds in one hour.

So if you travel at 38 metres per second, that is (38/1600) = 0.02375 miles per second.

And in an hour that would be 3600 x 0.02375 = 85.5 miles.

So the speed is 85.5 miles per hour.