Tom took a trip of 1,020 miles. he traveled by train at 55 miles an hour and the same number of hours by plane at 285 mph. how many hours did the trip take?
3 hours
6 hours
8 hours

What is the distance between point a and b

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Apossible wavelength for the color blue is 0.000000492 meter. which of the following is a reasonable estimate for this wavelength for the color blue? a. 5 × 10-6 m b. 5 × 107 m c. 5 × 10-7 m d. 5 × 106 m