A fast train takes 3 hours less th...
Question

A fast train takes 3 hours less than a slow train for a journey of ( 600 mathrm{km} ). If the speed of the slow train is ( 10 mathrm{km} / mathrm{h} ) less than that of the fast train, find the speeds of the two trains.

NEET/Medical Exams
Chemistry
Solution
124
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Lit spect of slow tran ( m=w mathrm{km} / mathrm{hr} )
( Rightarrow ) specd of fast train ( =(v+10) mathrm{km} / mathrm{m} )
( 3+ ) Time taken by fast hain ( = ) set time takou by slow thain
( Rightarrow quad 3+frac{600}{v+10}=frac{600}{v} )
( Rightarrow frac{600}{14}-frac{600}{v+10}=3 )
( Rightarrow frac{600(v+10-v)}{v(v+10)}=3 )
( Rightarrow quad v^{2}+10 v=2000 )
( Rightarrow quad v^{2}+10 v-2000=0 )
2) ( quad v^{2}+50 v-40 u-2000=0 )
( Rightarrow(u+50)(v-40)=0 )
( Rightarrow quad v=40 )
( (because v eq-50) )
Speed
of slow frain ( =40 mathrm{km} / mathrm{h} ) sbeed of fast train = 50 kmlh.

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