Petunia bought two plants she placed the first plant which was 20 inches tall, on the windowsill she noticed that the plant was growing at the rate of 1 inch per week. y=x+20

she placed the 2nd plant which was 5 inches tall on the coffee table, she noticed that it was growing at the rate of 2 inches per week,
y=2x+5
the heights of the two plants are shown in a graph
how many weeks will it take for the plants to reach the same height
a : 5
b : 10
c: 15
d :20