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**Mariner****Member**- Registered: 2010-06-16
- Posts: 35

Hi, I was wondering what is the best way to solve these types of questions in your head. no use of calculator.

D=S x T

S=500km/h , Time= 2h 30min

S=72km/h, time= 5h 24min

*Last edited by Mariner (2011-01-16 13:37:55)*

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**gAr****Member**- Registered: 2011-01-09
- Posts: 3,481

Hi Mariner,

If you are comfortable with usual multiplication, go ahead by converting mins to hrs, and multiply.

E.g. D = 72km/h * (5 + 24/60)h = 360 + 144/5 = 388.8km

Make sure about the units.

If you want a fast way, learn "Vedic mathematics".

"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense" - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."

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**soroban****Member**- Registered: 2007-03-09
- Posts: 452

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