Radha is trying to choose between two bike rental companies, Company A and Company B. Company A charges a $30 initial fee and an additional $6 for each hour rented. Company B charges an initial $21 fee and an additional $7 for each hour rented. The total cost to rent a bike from Company A can be represented by the equation c=6h+30c=6h+30 , where h represents the number of hours rented and c represents the total cost, in dollars. The total cost to rent a bike from Company B can be represented by the equation c=7h+21c=7h+21 , where h represents the number of hours rented and c represents the total cost, in dollars. For how many hours of rental is the amount charged by the two companies the same? What is the cost, in dollars, of renting the bike for this many hours?