exam Maths Puzzle Numerical Ability

if a stick that is 13 inches long casts a shadow of length 16 inches at the same time an office buildings shadow is 85 ft. long, how tall is the building? Round to one decimal place.

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exam Other Question

At 10:00 a.m. planes leave an airport. If the northbound plane flies at 280 mph and the southbound at 320mph, at what time will they be 1,000 miles apart? I have a question regarding Orseme's geometric graphical model?

the sum of 1/2 + 2/4 + 3/8 + ... + n/2^n + ... = 2.

I can't figure out how to prove this.