Unit 9 · Speed and Time Calculation
Express Train from Lode — When Did It Depart?
Lesson 5 of 9
About this lesson
When the express is four times as fast, it covers the same distance in one-quarter of the time. The slow train took 6 hours, so the express takes just 1½ hours — count back from 7:00 pm and the departure is 5:30 pm.
Chapters
Question
A slow train departed from Lode at 1:00 pm and arrived at Braxton at 7:00 pm.
An express train departed from Lode later and arrived at Braxton at the same time as the slow train.
The express train was four times as fast as the slow train.
Each train travelled at a constant speed and did not stop along the way.
When did the express train depart from Lode?
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