Roniel drove to the beach to pick up his friend . Heavy traffic mean he had to drive at an average speed of 55 mph, reaching the beach in 2 hours. He drove back home at an average speed of 77 mph. How long did the trip home take him?

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Can someone answer this question? : )

What is the missing step in this proof ?