One robot can do a task in 18 min. The second robot, working alone, can do the task in 15 min. About how many minutes will it take the the two robots, working together, to do the task?

Olive's solar powered scooter travels at a rate of 30 miles per hour. what equation can she use to calculate her distance with relation to the time she traveled? h=hours m=miles 1. h=m+30 2. m=30h 3. m=h+30 4. h=30m