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Video explanation: Aaron will jog from home at x miles per hour and then…

Dora says

I am confused by the question. Is the solution ‘d’ represents the total distance? although, I am understanding the question as how many miles can Aaron ‘Jog’, would this be the distant less than total Jog and Walk distance?

GMAT Quantum says

What they are saying is that Aaron will jog a certain distance from a starting point, and at some point he will return. When he turns around he will walk instead of jogging. The distance “d” that I have labelled is that distance that he jogs, and this distance is also the same length that he walks. Does that make sense?

In terms of your specific question, the total distance that he walks and jogs is exactly twice the distance he jogs.

Skye says

I’m tracking up until the very end…how does d(1/x + 1/y) become d(x+y/xy)? Thanks!

Skye says

Wait…I just remembered that in order to add fractions, you must have a common denominator! Nevermind! Thanks for putting together these videos!