stevesunishchiramel stevesunishchiramel

06-08-2019
Physics

contestada

John runs for 10 mins at a uniform speed 9kn/h. At what speed should he run for the next 20mins so that theaverage speed comes to 12km/h.

Respuesta :

MathPhys MathPhys

06-08-2019

Answer:

13.5 km/h

Explanation:

John runs for 10 min at 9 km/h, then 20 min at v. He will have run a total of 30 min at 12 km/h.

Therefore:

(30 min) (12 km/h) = (10 min) (9 km/h) + (20 min) v

v = 13.5 km/h

Answer Link

Otras preguntas

Determine the percentage composition of Ptl2

Name the living arrangement of Gleocapsa?

A frustum is formed when a plane parallel to a cone’s base cuts off the upper portion as shown. A cone is shown. The top of the cone is cut off to form a frustu

Which polygon is a convex heptagon? A polygon has 7 sides. No angles go inside of the shape. A polygon has 8 sides. No angles go inside of the shape. A polygon

Albe Read the passage. The age requirement for voting was enacted after the Civil War by the Fourteenth Amendment, setting the voting age at 21. The Twenty-Sixt

Albe Read the passage. The age requirement for voting was enacted after the Civil War by the Fourteenth Amendment, setting the voting age at 21. The Twenty-Sixt

Kara is a young photographer who has been given her first high-profile assignment. Alex is a professional athlete who has been in the spotlight for a number of

in what ways does George Orwell represent violence in animal farm?

Type the correct answer in each box. Use numerals instead of words.What is the solution to this matrix equation?

Which detail from the story is part of the conclusion? • A. The White family waits for a visit from Mr. White's old friend. • B. Mr. White is sorry he ever wish