Gilbert and Brian drove 604 miles in 11.6 hours. Gilbert drove the first part of the trip and averaged 45 miles per hour. Brian drove the remainder of the trip and averaged 65 miles per hour. For what length of the time did Gilbert drive?

The length of hours Gilbert drove is 7.5 hours.

The length of hours Brian drove is 4.1 hours.

Step-by-step explanation:

Let 'x' be the hours Gilbert drove.

Let 'y' be the hours Brian drove.

x+y = 11.6  (1)

45x+65y = 604 (2)

Multiply (1) by 45 and subtract (2) from (1)

 45x+45y = 522

-(45x+65y = 604)

       -20y = -82

y = 82/20

y = 4.1 hours

The length of hours Brian drove = 4.1 hours

Substitute y=4.1 in (1)

x+4.1 = 11.6

x = 7.5 hours

The length of hours Gilbert drove = 7.5 hours

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

there is no image or shapes attacted

step-by-step explanation: