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LUCKY_DIMON [66]
3 years ago
10

Lee and Sheby race clockwise around a 400 meter oval

Mathematics
1 answer:
bija089 [108]3 years ago
6 0

Answer:

6,000 meters

Step-by-step explanation:

Length of one lap d = 400 m

Lee's speed = u = 7.2 km/h. Shelby's speed v = 9 km/h

After time t, Shelby will run x meters to cover exactly 3 more laps than Lee.

So x = vt

and

x - 3d = ut

Note t = x/v, then

x - 3d = x*u/v

x (1 - u/v) = 3d

x = 3d/(1 - u/v) = 3*400/(1 - 7.2/9) = 6,000 meters

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