abooogie17 abooogie17
  • 03-07-2017
  • Mathematics
contestada

A test driver has to drive a car on a 1-mile track for two rounds in a way, that his average speed is 60 mph. On his first round his average speed is 40 mph. How fast does he need to drive, to get the right speed average?

Respuesta :

musiclover10045
musiclover10045 musiclover10045
  • 03-07-2017

(40+x)/2=60

40 +x = 120

x = 80


check :

40+80 = 120

120/2 = 60

 so his second round needs to be 80 mph

Answer Link

Otras preguntas

using the approximation 3.14 for π​, what is the radius of a circle with circumference 56.5 ​m?
a 26-mile section of a highway is designated as a scenic byway. New signs will be placed at the beginning and end of this section and at every 0.5 mile in betwe
an example of density is a. 2.17 centimeters. b. 2.174 liters. c. 2.17 grams per centimeter.
compare/contrast independent and dependent variables.
How do I do thiis question?
How do you write an inference?
what is a scientific species designation
How many times can 4 go into 110
most mechanical digestion takes place in the __________. esophagus small intestine large intestine mouth
Which of the following statements best describes the course of the Korean War during the last year-and-a-half of the conflict? A) Casualties were minimal. B) Ne