Simplify the following complex fraction 6/19 divided by 1/3 divided by 5/12

Me what is the value of x? showing work would be appreciated - ! : )

The average number of vehicles waiting in line to enter a parking lot can be modeled by the function f left parenthesis x right x squared over 2 left parenthesis 1 minus x right parenthesis endfraction , where x is a number between 0 and 1 known as the traffic intensity. find the rate of change of the number of vehicles waiting with respect to the traffic intensity for the intensities (a) xequals0.3 and (b) xequals0.6.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?