John and Jane are 20 m apart. John sees the top of the building at 30 and Jane sees the top of the building at 40. What is Jane's distance to the building?

2 over 5

step-by-step explanation:

the 2: 3 ratio is the length of the ac segment to the cb segment total length. this implies that the ratio between segment ac length and segment ab length is 2: 5. point c is 2/5 from a to b, so the required fraction is 2/5.

u rich

step-by-step explanation:

yes. we do proportions in probabilities.