A passenger train of length 60 m travels at a speed of 80 km/hr . Another freight train of length 120 m travels at a speed of 30 km/hr. The ratio of times taken by the passenger train to completely cross the freight train wheni) They are moving in the same directionii) In the opposite direction is
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a
2511
b
32
c
115
d
52
answer is C.
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Detailed Solution
→60 m80 km/hr →120 m30 km/hrRelative speed of passenger train= v1 - v2 =50 km/hr T1= total length of train =relative spped18050 Trains are moving in opposite directionRelative speed of train= v1 + v2 =110 km/hr T2=total length of train=relative speed180110 T1T2=11050=115