Find the distance, D, across the river. Assume that the ratio of d to 45 feet is the same as the ratio of 60 feet to 20 feet.

Answer 1

Let d be the distance across the river and let x be the distance from the starting point to the opposite bank of the river.

According to the given ratios, we can set up the equation:

d/45 = 60/20

Cross multiplying, we get:

20d = 45 * 60
d = (45 * 60) / 20
d = 135 feet

Therefore, the distance across the river is 135 feet.