Question 26183
The sun rose 90 degrees in 6 hrs.
Draw a triangle with the 42m tall tree and its 50m long shadow.
Using the inverse tangent you find the elevation angle of the sun
is 40.03 degrees above the horizon.
Multiply (40.03/90)(6 hrs)= 2.668 hr= 2hr and 40.08minutes
The time the shadow was 50m long was (5 hr + 2 hr 40min)= 7:40
The person standing next to the tree is x meters high with shadow 1.7 meters.
Therefore 42/50 = x/1.7
x=1.7(42/50)=1.428 meters

Cheers,
stan H.