Greg drove at a constant speed in a rainstorm for 287 miles. he took a break, and the rain stopped. he then drove 102 miles at a speed that was 10 miles per hour faster than his previous speed. If he drove for 9 hours, find the car's speed for each part of the trip

38.22mph and 48.22mph

Explanation:

We first find Greg's average speed as follows. The average speed of a body is defined as the ratio of the total distance travelled by the body to the total time spent.

Total time spent, t = 9 hours

Total distance travelled, s = 287 + 102

s = 389 miles.

Hence the average speed is given thus;

Let the speed for the first part of his journey be u and that for the last part be v, his average speed can also be expressed as follows;

Hence;

As stated in the problem, his speed for the final part of the journey was 10mph faster, therefore;

By substituting (3) into (2), we obtain the following;

Hence,

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle