A man cycles to a village at 18km/hr and returns at 12km/hr. If he takes 6 tahrs for the double journey, how far does he ride altogether?

Yes, two vertical lines can be complementary

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.