Friday, February 22, 2019

Thursday, February 14, 2019

Problem 92: Two trains and a fly


Two trains, each travelling at a speed of  are headed toward each other on the same track. At the exact moment, the trains are  apart, a fly on the front of one train begins flying back and forth between the two trains at a speed of  As soon as the fly reaches one train, it can instantaneously turn and fly back towards the other one.
What is the total distance the fly will have travelled before getting crushed between the trains?

Source: Brilliant

Friday, February 8, 2019

Problem 90: What Fraction is Shaded?






Sources: @CDawson18, @Ousebank, @MathCeyhun, @_WTProject





Problem 89: 90-60-30


View image on Twitter AB/BC ?