#39; and '$4 l#39; are travelling into a tunnel of length '$\mathrm{L}#39; in parallel tra. Tags and topics: JEE MAIN,JEE Advanced,JEE Mains,KCET,Motion in a Straight Line,Basic Definitions,NCERT,NEET, JEE Main Physics,Class 11 Physics,Class 12 Physics."> #39; and '$4 l#39; are travelling into a tunnel of length '$\mathrm{L}#39; in parallel tra. Tags and topics: JEE MAIN,JEE Advanced,JEE Mains,KCET,Motion in a Straight Line,Basic Definitions,NCERT,NEET, JEE Main Physics,Class 11 Physics,Class 12 Physics."> #39; and '$4 l#39; are travelling into a tunnel of length '$\mathrm{L}#39; in parallel tra. Tags and topics: JEE MAIN,JEE Advanced,JEE Mains,KCET,Motion in a Straight Line,Basic Definitions,NCERT,NEET, JEE Main Physics,Class 11 Physics,Class 12 Physics.">
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Question

Two trains 'A' and 'B' of length '$l$' and '$4 l$' are travelling into a tunnel of length '$\mathrm{L}$' in parallel tracks from opposite directions with velocities $108 \mathrm{~km} / \mathrm{h}$ and $72 \mathrm{~km} / \mathrm{h}$, respectively. If train 'A' takes $35 \mathrm{~s}$ less time than train 'B' to cross the tunnel then. length '$L$' of tunnel is :

(Given $\mathrm{L}=60 l$ )

900 m
1200 m
1800 m
2700 m

Solution

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