Qualification > Math
Additional Math Help HERE ONLY...!
vanibharutham:
dont see those questions coming for additional maths :S
have no idea how to solve them
Padapop:
:D
astarmathsandphysics:
Closing speed is68-8 equals 60 so t equals d/v=2.5
astarmathsandphysics:
--- Quote from: ADi...M on May 28, 2009, 01:55:25 pm ---Q. A train 150m long is running with a speed of 68mph. In whate time will it pass a man who is running at 8mph in the same direction which the train is going.
Q. A and B undertake to do a peice of work for $600. A alone can do it in 6 days while B alone can do it in 8 days. With the help of C
they finish it in 3 days. Find the share of each??
hope u help..
--- End quote ---
man a does $100 of work a day so in 3 days earns $300
man b does $75 dollars of work a day so earns $225
Mean c earns $600 -$225-$300=$75
ans is 300:225:75 or 4:3:1
vanibharutham:
--- Quote from: astarmathsandphysics on May 29, 2009, 02:03:53 pm ---Closing speed is68-8 equals 60 so t equals d/v=2.5
--- End quote ---
how can u be sure that they start from the same position?
isnt this relative velocity?
Surely if The train starts off at lets say (10i + 20j) and has a velocity of 68m/s
Its position would be (10i + 20j) + 68*t
Isnt the whole thing dependent on position?
i dont know? ??? could you explain
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