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An old railroad car was able to haul one days worth of coal in 15 hours the new railroad car only takes 10 hours because of high demand both cars are used at the same time how long will it take them to transport one day supply of coal

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ChoiSungHyun

Step-by-step explanation:

Old Railroad Car:

  • 1 day of coal in 15 hours
  • 1/15 days of coal in 1 hour

New Railroad Car:

  • 1 day of coal in 10 hours
  • 1/10 days of coal in 1 hour

Total number of days of coal in 1 hour

= 1/15 + 1/10 = 1/6.

Since there is 1/6 days of coal in 1 hour,

there will be 1 day of coal in 6 hours.

It will take them 6 hours to transport the supply.

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