A scuba diver dives in a straight line from a boat to a coral reef, as shown below.
Before the dive, the diver has 2200 litres of gas in his dive tank.
When diving from the boat to the reef, he uses an average of 4.6 litres of gas
per metre travelled.
How much gas does the diver have in his tank when he reaches the coral reef?
Give your answer to the nearest litre.
34 m
123 m
Not drawn accurately