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IceJOKER [234]
2 years ago
8

PLEASE I NEED THIS SO MANY POINTS

Mathematics
1 answer:
katovenus [111]2 years ago
4 0

The speed of Sali is 18.75 km/hr.

Given,

Total distance travelled by Jane and Sali =63 km.

The total time is taken by Jane=3.5 hours.

Sali started to cycle 4 minutes after Jane started to cycle =\frac{4}{60}=\frac{1}{15} hours.

<h3>What is the formula to find speed?</h3>

The formula to find speed is Speed=\frac{Distance}{Time} \ km/hr.

The speed of Jane=\frac{63}{3.5}=18 \ km/hr.

Let the speed of Sali be x \ km/hr.

Sali caught up with Jane when they had both cycled 30 km.

Thus, \frac{30}{18}-\frac{30}{x}=\frac{1}{15}

\implies \ \frac{30x-540}{18x} =\frac{1}{15}

\implies \ 15(30x-540)=18x

\implies \ 5(30x-540)=6x

\implies \ 150x-2700=6x

\implies \ 144x=2700\implies \ x=18.75

Therefore, the speed of Sali is 18.75 km/hr.

To learn  more about the speed visit:

brainly.com/question/7359669.

#SPJ1

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\longrightarrow{\blue{ C.  \: 2 {x}^{2}  + 4x - 30 = 0 }} 

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