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If a bus driver leaves her first stop by 7:00 a.m., her route will take less than 37 minutes. If she leaves after 7:00 a.m., she estimates that the same route will take no less than 42 minutes. Which inequality represents the time it takes to drive the route, [tex]r[/tex]?

A. [tex]r \ \textless \ 37 \text{ or } r \geq 42[/tex]

B. [tex]r \ \textless \ 37 \text{ or } r \ \textgreater \ 42[/tex]

C. [tex]37 \ \textless \ r \leq 42[/tex]

D. [tex]37 \ \textgreater \ r \leq 42[/tex]

Sagot :

Certainly! To determine which inequality correctly represents the time [tex]\( r \)[/tex] it takes to drive the route under the given conditions, we can analyze the details provided.

1. Condition 1: If the bus driver leaves by 7:00 a.m., the route takes less than 37 minutes.
2. Condition 2: If the bus driver leaves after 7:00 a.m., the route takes no less than 42 minutes.

Let's interpret each condition individually:

- Condition 1: Leaving by 7:00 a.m. results in a route time of less than 37 minutes. Mathematically, we can express this as:
[tex]\[ r < 37 \][/tex]

- Condition 2: Leaving after 7:00 a.m. results in a route time that is no less than 42 minutes. This means the time [tex]\( r \)[/tex] is at least 42 minutes or more. Mathematically, we can express this as:
[tex]\[ r \geq 42 \][/tex]

Combining these two conditions, we find that the time [tex]\( r \)[/tex] can either be less than 37 minutes, or it must be equal to or greater than 42 minutes.

Thus, the correct inequality representing the time [tex]\( r \)[/tex] is:
[tex]\[ r < 37 \text{ or } r \geq 42 \][/tex]

So, the inequality that correctly represents the time it takes to drive the route is:

[tex]\[ \boxed{1: r < 37 \text{ or } r \geq 42} \][/tex]