Question

PLEASE I NEED THIS SO MANY POINTS

Answer 1

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.

What is the formula to find speed?

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.

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