Let's figure this out by converting both speeds to the same units:

1. Convert km/h to mph:

* 1 kilometer is approximately equal to 0.621371 miles.

* Therefore, 45 km/h is equal to 45 * 0.621371 ≈ 28.0 mph.

2. Compare:

* 45 km/h (approximately 28 mph) is less than 40 mph.

So the answer is no, 45 km/h is not more than 40 mph.