Question

The first stage of a rocket burns 28 seconds longer than the second stage. If the total burning time for both stages is 152 seconds then how long does each stage burn? Solve.

Answer 1

The 1st stage: x,  the 2nd stage:  y.
x + y = 152
x = y + 28
y + 28 + y = 152
2 y = 152 - 28
2 y = 124
y = 124 : 2 = 62
x = 62 + 28 = 90
Answer: the first stage burns 90 seconds and the second burns 62 seconds.