Someone help me please

104

Step-by-step explanation:

I think, from picture angle of B is 90.

Sum all of the angles must be 360, so angle in point R is

R=360-92-74-90=104

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.