Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 2011-01-16 13:25:32

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

### Distance problems

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)

Offline

## #2 2011-01-16 15:03:40

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

### Re: Distance problems

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
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."

Offline

## #3 2011-01-16 17:18:42

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

. .

. .

.

Offline