ilovecandy123
contestada

One circuit of a model race car track measures 25 M. Jack's car took 60 s to complete 5 laps. Alice's car took 78 s to complete 6 laps. Sarah's car took 44 s to complete 4 laps.

A) find what average speed of each car to the nearest tenth.
B) which car runs the fastest?

This is a percent word problem and I need to show all my work! I'm stuck on this problem and I need some help ❤️

Respuesta :

ultrasoulviver
(25/60)*5=x
(25/78)*6=y
which is grater x or y
dzharvey
The equation that relate distance (D) time (T) and speed (S) is: D=ST 

Track 25M (one lap equals 25M)

A.
Jack 60s, 5laps; D=25x5 = 125M; T=60s ; S=D/T=125/60 =2.08M/s Speed=2.1M/s

Alice 78s, 6 laps; D=25x6 = 150M; T=78s; S=D/T=150/78=1.92 M/s
Speed 1.9 M/s

Sarah 44s, 4 laps; D=25x4 = 100M; T=44s; S=D/T=100/44=2.27 M/s
Speed 2.3 M/s

B.
Sarah's speed is more than the other drivers at 2.3 M/s

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