A man took 1.5 hours to drive 108 km from London to Brighton. He used 11.25 litres of petrol. Complete these sentences. (a) His average speed was
km/h.

(b) His petrol consumption was
km/litre.

For part of the journey he drove at an average speed of 104 km/h for 50 minutes.

(c) For the rest of the journey he drove for 40 minutes
at an average speed of
km/h.

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?