One pump fills a tank in 20 hours and another in 15 hours. when a third pump is added the tank fills in 6 hours. find out how long it takes the 3rd pump to fill the tank alone.

the forst and 3rd

step-by-step explanation:

plants store their excess carbohydrate in the form of starch so that it could be used as energy source later on. the excess carbohydrate is converted into starch in the plastid i.e. chloroplast & this process occurs in the presence of sunlight. it is an insoluble polymer of glucose which gets stored in cell organelles named as amyloplasts. in some plants, starch is also stored in roots and embryos.