A train running at the speed of 48 km/hr crosses a pole in 9 seconds. What is the length of the train?
(a) 150m
(b) 120m
(c)90m
(d)80m

Ans : 120m

• speed= 48 km/h = 48* 5/18 m/s
  time= 9 sec
  
  so length= speed*time = 48* 5/18 *9 = 120 m
  (b) 120m
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• ans b) 120m
  according to the formula- t=lt/vt
  9=lt/40/3
  so lt= 120 m
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• (b) 120
  48*(5/18)*9 = 120
  
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• 48*5/18*9=120
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• ans.-120 m
  length=speed*time=48*(5/18)*9=120 m
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• according to the formula- t=lt/vt
  9=lt/40/3
  so lt= 120 m
  
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• Train length means Distance,so here Speed=48 Km,Time=9sec so Distance =Speed*Time,convert speed in m/sec...48*5/18=24*5/9 so 24*5*9/9 i.e 24*5=120 m (b)
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