Plz a car travels from a to b at a speed of 40 mph then returns, using the same road, from b to a at a speed of 60 mph. what is the average speed for the round trip?

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

41/17 as a decimal rounded to the nearest hundredth

Can someone tell me if this is perpendicular? !