After an accident, police can estimate the speed that a car was traveling by measuring its skid marks. The formula r=2√5L can be used, where r is the speed, in miles per hour, and L is the length of the skid marks, in feet.
Estimate the speed of a car that left skid marks (a) 50 ft long; (b) 180 ft long.

How fast was the car traveling if it left skid marks 50 ft long?
(Simplify your answer. Type an integer or a decimal. Round to the nearest tenth.)

How fast was the car traveling if it left skid marks 180 ft long?
(Simplify your answer.Type an integer or a decimal. Round to the nearest tenth)

Question

After an accident, police can estimate the speed that a car was traveling by measuring its skid marks. The formula r=2√5L can be used, where r is the speed, in miles per hour, and L is the length of the skid marks, in feet.
Estimate the speed of a car that left skid marks (a) 50 ft long; (b) 180 ft long.

How fast was the car traveling if it left skid marks 50 ft long?
(Simplify your answer. Type an integer or a decimal. Round to the nearest tenth.)

How fast was the car traveling if it left skid marks 180 ft long?
(Simplify your answer.Type an integer or a decimal. Round to the nearest tenth)

anonymous · Answer

this has to be (without exaggeration) the 8th time i have seen this exact problem.  put 
$$r=2\sqrt{5\times 50}$$ and 
$$r=2\sqrt{5\times 180}$$ to get your answer

anonymous · Answer

lol i keep posting it cuzz no one wants to give me the answer.

anonymous · Answer

Wuts 14.83239697 & 60 Rounded to the nearest tenth?

anonymous · Answer

times 60??

anonymous · Answer

No there separate #'s.

anonymous · Answer

I need to know wut 14.83239697 is Rounded to the nearest tenth & wut 60 is Rounded to the nearest tenth.

anonymous · Answer

14.8 and 60.0

anonymous · Answer

kk THANK YOU!!! ^_^

austinl · Answer

I have seen this problem several times... what is the kill about it, is the fact that it is a simple plug and chug.