Posted by **bill** on Sunday, January 21, 2007 at 12:53pm.

Ken's average driving speed is 25km/hr faster than Jim's. In the same length of time it takes Ken to drive 279 km, Jim drives only 204 km. What is Ken's average speed?

Possible Answers:

a) 93 km/hr

b) 118 km/hr

c) 43 km/hr

d) 68 km/hr

Let x equal the speed of Jim's car.

279/x + 25 = 204/x

204x + 5100 = 279x

5100 = 75x

5100/75 = 75/75x

x = 68km/h

Therefore the avg. speed of Jim's car is 68km/h. Since Ken's car is 25km/h faster...68+25 = 93km/h.

Therefore the avg. speed of Ken's car is 93 km/h.

## Answer this Question

## Related Questions

- Math - Jim bought some chocolates and gave half of it to Ken.Ken bought sweets ...
- math - Jim bought some chocolatees and gave half of it to Ken. Ken bought some ...
- Math Word problem - Ben and Ken live in homes that are 10 miles apart. Both ...
- math - at 7:00am joe starts jogging at 6 mi/h. at 7:10 am ken starts after him. ...
- Math - Joe weighs 30 lbs less than twice ken's weight. If ken gains 10 pounds ...
- math - frank is 3 times old as ken. frank is 15 years older than eileen, while ...
- Math - Jan built a cube from unit cubes (each 1 by 1 by 1 unit). Ken took this ...
- Maths - The average mass of Ken, David and Kelvin is 42 kg. David is 6 kg ...
- Math - Joe weighs 30 lbs less than twice ken's weight. If ken gains 10 pounds ...
- math - ken and mark have some ducks and pigs. when asked how many ducks and pigs...