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?

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Answer 1 · 2016-06-09T13:52:33

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

As car travels $38$ $38$ meters in each second,

in one hour or $3600$ $3600$ seconds, it travels $38 \times 3600 = 136800 m$ $38xx3600=136800m$ .

Now each mile has $1609.34$ $1609.34$ meters.

So in one hour car travels $\frac{136800}{1609.34} = 85$ $136800/1609.34=85$ miles

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

Driver is exceeding the speed limit.

Answer 2 · 2018-08-14T15:12:15

Yes, the car is travelling at 85.5 mph.

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.