Friday

September 19, 2014

September 19, 2014

Posted by **tanmay bhoite** on Wednesday, April 11, 2012 at 2:20am.

- physics -
**drwls**, Wednesday, April 11, 2012 at 2:48amFirst case:

Total distance = L (km)

Time at 40 km/h = 0.1 L/40

Time at 90 km/h = 0.9 L/90

Total time = (.0025+.01)L

Average speed = L/(.0125) = 80 km/h

Second case:

Total trip time = T

Distance covered at 40 km/h = 40*0.1T = 4.0 T km

Distance travelled at 90 km/h = 90*0.9T = 81 T km

Average speed = 85T/T = 85 km/h

**Answer this Question**

**Related Questions**

math - Q) (Speed) Ahmed drives from Abu Dhabi to Dubai. The journey takes him 1 ...

Physics - These are “plug-in-the-number” tasks to familiarize you with the main ...

physics - if an object has covered first 30 m distance in 5 sec and other 40 m ...

sCiEnCe - Can you define speed, motion, constant speed and average speed? And ...

Physics - A truck speed increases uniformly from 10 m/s to 30 m/s in 20 seconds...

math-calculus - a plane flew from red deer to winnipeg, flying distance of 1260 ...

physics - You drive on an interstae 10 from San Antonio to Huston, half the [b]...

physics - A cyclist is cycling at a uniform velocity of 8m/s for 8 seconds. He ...

physics - A runner, beginning at rest, completed a 50 m run with a final speed ...

Mathematics - For the first 1 1/2 hours of a 91km journey the average speed was ...