15/7 times 4/5 times 7/2 i can't figure this out

How do you use the elimination method for this question? explain, because i really want to understand!

Stefano accidentally dropped his sunglasses off the edge of a canyon as he was looking down. the height, h(t), in meters (as it relates to sea level), of the sunglasses after t seconds, is shown in the table. during its descent, the pair of sunglasses passed by a climber in the canyon 6 seconds after stefano dropped them. to the nearest meter, what is difference in elevation between stefano and the climber? 166 meters 176 meters 230 meters 240 meters its b.176 i took the test 166 is wrong and 176 is correct

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14