a The fewer the worker, the longer to finish the job. 3. From home to work with a distance of 80 km, it will take Marco 2 hours to travel if his average speed is 40km/hr. If he will speed up to 60 km/hr, it will only take him 1.5 hours to travel 4. The number of minutes needed to solve an exercise set of variation problems varies directly as the number of problems and inversely as the number of students working on the solutions. It takes 36 minutes for 4 students to solve 18 problems. 5. The volume V of a cone varies jointly as the height h of the cone and the area of the base B. A cone has a volume of 140 with height 15 and base 28. 6. The World Health Organization reported the rising number of COVID 19 cases as days go by. The number of confirmed cases increases by 2420 persons per million population daily. 7. Due to the pandemic, large number of graduates from the different universities and colleges in the Philippines have low chances of securing jobs. ho the missing variable in the following direct and in a​