How many seconds Luis ran?

Question

jaxon and Luis ran a race. Jaxon began running 3 seconds before Luis, and Luis completed the race 1 second before Jaxon. Jaxon ran for 32 seconds. For how many seconds did Luis run?

Answer 1

 J = Jaxon's total time = 32        Assume Jaxon's start time = T0 = 0 sec

 

Total Time = Tf - T0      where:  Tf = time to complete race    T0 = start time

 

 L = Luis's total time =  Tf  - T0   

 

Tf = J - 1

T0 = 0 + 3

 

L = Tf - T0 = (J - 1) - (0 + 3)  =  J - 4  = 32 - 4 = 28 sec

 

L = J                        -3 - 1 = 32 - 4 = 28 seconds