21. amos, peter, and carlos begin running around a circular track at the same
time, from the same start line. it takes amos 12 minutes to complete one lap
around the track. it takes peter 9 minutes, and it takes carlos 8 minutes to
complete one lap around the track. if the three boys continue running round
the track at their same rate of speed, in how many minutes will the three
boys pass one another?

moderators are

perimeter of the base times height

step-by-step explanation:

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0