how to solve this ? the question asked, the distance between two houses P&Q is 200 kilometer. Joe travel by car from P to Q at average speed of x km/h

a) write down an expression in terms of X for the number of hours he took to travel from P to Q.

b) he returned from Q to P at an average of (x + 5) km/h. write down an expression in terms of X for the number of hours he took to travel from Q to P

c) the total time he took to go from P to Q & to return from P to Q was 8 hours