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The train traveled at s meters per minute for d meters and arrived t minutes late to its destination. How fast should the train have traveled to make it to its destination on time?
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The train traveled at s meters per minute for d meters and arrived t minutes late to its destination. How fast should the train have traveled to make it to its destination on time?
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well, i must admit i can't figure that 1 out...
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the train will cover Ts metres, in T minutes
it arrived t minutes late.
i.e. d = s(T+t), you want the train to be on time, so t must be 0,
i.e. s(T+t) = ST, where S is the new speed.
so the speed it should have travelled at will be
where T is the time it should take to reach the destination, and t is how many minutes it was late, when travelling at s metres per
minute
if you dont want to have T in the equation, then take d = s(T+t) = sT + st, then sT = d - st, and
i.e.
Last edited by luca-deltodesco (2006-11-09 10:42:21)
The Beginning Of All Things To End.
The End Of All Things To Come.
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