In what time will a train 100 metres long with a speed of 50 km/hour c

1.	In what time will a train 100 metres long with a speed of 50 km/hour cross a pillar? (a) 7 seconds (b) 72 seconds (c) 7.2 seconds (d) 70 seconds
Answer» (c) 7.2 sec Speed of the train = 50 km/hr = \(50\times\frac{5}{18}\) m/sec = \(\frac{125}{9}\) m/sec Distance travelled = Length of train = 100 m ∴ Time taken to cross the pillar = \(\frac{100}{\frac{125}{9}}\) seconds = \(\frac{36}{5}\) seconds = 7.2 sec.

In what time will a train 100 metres long with a speed of 50 km/hour cross a pillar? (a) 7 seconds (b) 72 seconds (c) 7.2 seconds (d) 70 seconds

Answer»

(c) 7.2 sec

Speed of the train = 50 km/hr = \(50\times\frac{5}{18}\) m/sec

= \(\frac{125}{9}\) m/sec

Distance travelled = Length of train = 100 m

∴ Time taken to cross the pillar = \(\frac{100}{\frac{125}{9}}\) seconds

= \(\frac{36}{5}\) seconds = 7.2 sec.

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In what time will a train 100 metres long with a speed of 50 km/hour cross a pillar? (a) 7 seconds (b) 72 seconds (c) 7.2 seconds (d) 70 seconds

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