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Three Buses

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Intern
Joined: 06 Feb 2018
Posts: 1

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06 Feb 2018, 05:16
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Three buses make the same journey every day on a route that has bus stops at exactly equal distances apart. The buses all travel at constant (but different) speeds. At the first stop after the starting point, if you just miss the fast bus (Fbus), then you wait 20 minutes for the medium-speed bus (Mbus), or 30 minutes for the slow bus (Sbus). At the second stop, missing Fbus would result in a wait of 30 minutes for Mbus, or 1 hour 10 minutes for Sbus.  Which of the following departure times from the start of the route could explain these waiting times?
A Fbus 07:30, Mbus 07:40, Sbus 07:50
B Fbus 07:40, Mbus 07:50, Sbus 07:30
C Fbus 07:50, Mbus 07:30, Sbus 07:40
D Fbus 07:40, Mbus 07:30, Sbus 07:50

What's the answer and how do we solve this question?

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Math Expert
Joined: 02 Sep 2009
Posts: 48110

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07 Feb 2018, 08:09
akz wrote:
Three buses make the same journey every day on a route that has bus stops at exactly equal distances apart. The buses all travel at constant (but different) speeds. At the first stop after the starting point, if you just miss the fast bus (Fbus), then you wait 20 minutes for the medium-speed bus (Mbus), or 30 minutes for the slow bus (Sbus). At the second stop, missing Fbus would result in a wait of 30 minutes for Mbus, or 1 hour 10 minutes for Sbus.  Which of the following departure times from the start of the route could explain these waiting times?
A Fbus 07:30, Mbus 07:40, Sbus 07:50
B Fbus 07:40, Mbus 07:50, Sbus 07:30
C Fbus 07:50, Mbus 07:30, Sbus 07:40
D Fbus 07:40, Mbus 07:30, Sbus 07:50

What's the answer and how do we solve this question?

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: Three Buses &nbs [#permalink] 07 Feb 2018, 08:09
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