(d) 80 KINI (40 km/hr of A train 50...
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(d) 80 KINI (40 km/hr of A train 500 metres long crosses a platform 12 seconds. length 900 metres in 1 minutes What is speed of train in km /hr ? (b) 5 km/hr (a) 45 km/hr (c) 54 km/hr (d) 70 km/hr

Railway Exams
Maths
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( ell=500 mathrm{m} ) ( L=a cos m ) [ t=72 mathrm{su} ] ( longrightarrow ) to tal dist. to be covered ( =900+500=1400 mathrm{m} ) ( v=frac{d}{t}=frac{frac{250}{100^{2}} 175}{frac{frac{t 400}{-72}}{frac{36}{189}}} ) ( v=frac{175}{9} mathrm{m} / mathrm{sen} ) ( v=frac{175}{9} times frac{18}{5} operatorname{lcm}(h Rightarrow 70 mathrm{km} / mathrm{h} )
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