mathematical challenge?

epalmuchkasi:

This is a mathematical challenge, and it’s been said that:   

• If you’re an engineer, you should be able to solve it in (under) three minutes, 
• if you’re an architect, in three hours;   
• if you’re a doctor, in six hours;   
• if you’re an accountant, in three months and   
• If you’re a lawyer, probably never.   

Engineer material, yes? This is easy-peasy.

(via epalmuchkasi-deactivated2012010)