X=600-20*t a)t-?,x=300м,100м,20м,0м,-20м b)x-?,t=10с,20с,0,5мин

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a)

x = 300m
300 = 600 - 20t
20t = 600 - 300
20t = 300
t = 15 seconds

x = 100m
100 = 600 - 20t
20t = 600 - 100
20t = 500
t = 25 seconds

x = 20m
20 = 600 - 20t
20t = 600 - 20
20t = 580
t = 29 seconds

x = 0m
0 = 600 - 20t
20t = 600
t = 30 seconds

x = -20m
-20 = 600 - 20t
20t = 600 + 20
20t = 620
t = 31 seconds

b)

t = 10 seconds
x = 600 - 20*10
x = 600 - 200
x = 400m

t = 20 seconds
x = 600 - 20*20
x = 600 - 400
x = 200m

t = 0 seconds
x = 600 - 20*0
x = 600m

t = 5 minutes = 300 seconds
x = 600 - 20*300
x = 600 - 6000
x = -5400m