Final answer:
To convert 90 km/h to mph, multiply by the conversion factor of 0.621371. After performing the calculation, we find that Jessica is traveling approximately 56 mph.
Step-by-step explanation:
Jessica is traveling at 90 km/h, and you wish to convert this speed into miles per hour (mph). To do this conversion, you can use the approximate relationship that 1 kilometer is equal to 0.621371 miles. Therefore, to convert 90 km/h to mph, you multiply by this factor:
90 km/h × 0.621371 = 55.92339 mph.
When we check if the answer is reasonable, we can round to a more conventional number, which will give us approximately 56 mph as the speed Jessica is traveling in miles per hour.