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A train leaves from a city called Knox heading towards Bronx at...........when they meet, which train is closer to Knox?

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A train leaves from a city called Knox heading towards Bronx at 120 km/h.

Three hours later, a train leaves Bronx heading towards Knox at 180 km/h.

Assuming there’s exactly 5000 kilometers between Bronx and Knox, when they meet, which train is closer to Knox?

posted Jul 17, 2017 by Parampreet Kaur

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1 Answer

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Short answer: Both trains would be at the same spot when they meet therefore they are both equally close to Knox.

To know the point where they actually meet here is the math below.

Train from Knox ======> TK
Train from Bronx =====> TB

Distance travelled by TK after 3 hours = 120*3 = 360 Km
Now the point where both TK and TB meet is easily found out by adding the velocity of TB to TK and calculating the time taken to cover the current distance
Current distance between TB and TK = 5000 - 360 = 4640
Time taken for that to happen after the initial 3 hours of travel for TK is 4640/(120+180) = 15.4667 Hours = 15 Hours 28 Minutes.
Distance travelled by TK in 15 hours and 28 minutes = 120*15+120*28/60 = 1800 + 56 = 1856 Km
Therefore TK is 1856 + 360 = 2216 Km away from Knox
In that time TB has travelled 5000 -2216 = 2784 Km or 180*15 + 180*28/60 = 2700 + 84 = 2784 Km

answer Jul 17, 2017 by Tejas Naik

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