How long does it take for a bicyclist to travel 90 miles at the rate of 18 miles per hour

5 hours

Step-by-step explanation:

We are given that a bicyclist travels for 90 miles at the rate of 18 miles per hour and we are to find the time he took to complete this journey.

We will use the speed - distance formula here to find the time:

Time = Distance / speed

So substituting the given values in the above formula:

Time = 90 / 18 = 5 hours

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.