Friday

August 22, 2014

August 22, 2014

Posted by **krishna** on Monday, July 15, 2013 at 7:18am.

- maths -
**MathMate**, Monday, July 15, 2013 at 7:22amTwo trains with speeds s and s+5 km/hr.

Initial distance=340 km

final distance = 30 km

Total distance travelled = 340-30=310 km

Total speed = s+s+5=2s+5

Time = 2 hrs

Form equation equating distance travelled

Time*speed=distance, or

2(2s+5)=310

2s+5=155

2s=150

s=75

Speeds of trains are 75 km/h and 80 km/hr

- maths -
**mahesh**, Monday, July 15, 2013 at 7:37amIf one train has a velocity of V km/h, the other one will have velocity V+5 km/h approaching the first train. Therefore Relative velocity will be V+V+5=2V+5 km/h.

Distance travelled by them in 2 hrs is 340-30=310km which is =2(2V+5)

Thus 4V+10=310 or 4V=300 hence V=75km/h and other train has a velocity of 80km/h.

Check: in 2 hrs they will move 75x2+80x2=150+160=310km =340-30 km. OK.

**Related Questions**

math - the distance between two stations is 300km. two trains start ...

Math - Plz help me to solve this question The distance between two stations A & ...

physics - two metra trains are on separate but parallel tracks. One has a speed ...

Pre-Calculus-Trig - Two trains depart simultaneously from the same station. The ...

Math - The distance btwn two stations A and B is 230km.two motrcyclst start ...

math - two trains start from towns 208 miles apart and travel towards each other...

math - The distance between Delhi and Meerut is 75km . Two trains at a speed of ...

Physics - Two trains with 112-Hz horns approach one another. The slower of the ...

calculus - two trains are on parallel tracks that are 2 miles apart. If both ...

maths - Two trains are on the same track a distance 300 km apart heading ...