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Aeron, Ben, John drive at the constant speed. The average speed of Ben is 3/4 of Aeron. The ratio of John's average speed to Ben's average speed is 13:15. If Aeron's average speed is 60 km/h. What is John's average speed? Give the answer to the nearest whole number.

(1) 65 km/h
(2) 87 km/h

(3) 55 km/h
(4) 42 km/h

 Jul 17, 2022
 #1
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It's actually

Aeron, Ben, John drive at the constant speed. The average speed of Ben is 5/4 of Aeron. The ratio of John's average speed to Ben's average speed is 13:15. If Aeron's average speed is 60 km/h. What is John's average speed? Give the answer to the nearest whole number.

(1) 65 km/h
(2) 87 km/h

(3) 55 km/h
(4) 42 km/h

 Jul 17, 2022
 #2
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+1

Let, John's average speed = 13x km/h.

Ben's average speed = 15x

Given, Ben's average speed = 5/4 * 60 = 75

15x = 75

=> x = 5

John's average speed = 13 * 5 = 65 km/h.

(1) 65 km/h.

 Jul 17, 2022

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