UPSEE 2018 Solved Paper

Given, velocity of train w.r.t. the earth,$v_{T\rightarrow E}=80\,\text{km/h}$ .......(i) Velocity of the man w.r.t. the train, $v_{M\rightarrow T}=-10\,\text{km/h}$ .......(ii) Velocity of the plate w.r.t. the man, $v_{P\rightarrow M}=-20\,\text{km/h}$ ........(iii) Velocity of the spider w.r.t. the plate, $v_{S\rightarrow P}=5\,\text{km/h}$ .......(iv) From Eqs. (i), (ii), (iii) and (iv), we get $\therefore$ The velocity of the spider w.r.t. the earth, $v_{S\rightarrow E}=V_{S\rightarrow P}+V_{P\rightarrow M}+V_{M\rightarrow T}$ $+V_{T\rightarrow E}$ $=5-20-10+80$ $=55\,\text{km/h}$ (towards Hubli)