To get the speed of growth of plant we proceed as follows; rate=(distance)/(time taken) distance( length) of growth of the plant in 14 days is 3.6 m. 1 day=86400 sec 14 days=86400x14=1,209,600 sec
1 m=1000000 micrometer 3.6 m=3600000 micrometer thus the rate of growth will be: 3600000/1209600 =2.9762 micrometers per second