Carcass wrote:

The Sun is approximately 1,400 million kilometers from the planet Saturn, and light from the Sun travels to Saturn at the rate of approximately 300,000 kilometers per second. Approximately how many minutes does it take for light to travel from the Sun to Saturn?

A) 80

B) 130

C) 160

D) 280

E) 360

Since 1 million = 10^6, we can re-express the distance from the Sun to Saturn as 1,400 x 10^6 kilometers. We can also express the light’s rate as 3 x 10^5. The time to travel from the Sun to Saturn, in seconds, is:

(1,400 x 10^6)/(3 x 10^5) = (1,400/3) x 10^1 sec = 14,000/3

In minutes, that is (14,000/3)/60 = 14,000/180 = 1400/18 = 700/9 ≈ 80.

Answer: A

_________________

Jeffery Miller

Head of GRE Instruction

GRE Quant Self-Study Course

500+ lessons 3000+ practice problems 800+ HD solutions

**Circles 12 colorful Ethnic Womens Classic Tribal 5 Floral Color11 Boots Snow 5 Print Pattern InterestPrint Ladies Size Doodle**