An unequal-armed seesaw has been constructed from a straight rod and a support placed perpendicular to the ground on this rod. When the left end of this seesaw placed on a flat ground touches the ground as shown in Figure 1, the height of the right end from the ground is 180 cm. When the right end of the seesaw touches the ground as shown in Figure 2, the height of the left end from the ground is 90 cm. Accordingly, what is the length of the support placed on the seesaw in cm? A) 45 B) 54 C) 60 D) 75 E) 81
An unequal-armed seesaw has been constructed from a straight rod and a support placed perpendicular to the ground on this rod. When the left end of this seesaw placed on a flat ground touches the ground as shown in Figure 1, the height of the right end from the ground is 180 cm. When the right end of the seesaw touches the ground as shown in Figure 2, the height of the left end from the ground is 90 cm.
Accordingly, what is the length of the support placed on the seesaw in cm?
A) 45
B) 54
C) 60
D) 75
E) 81