Question

) A man in a train notices that he can count 31 poles
in one minute. If they are known to be 50metres
apart, then at what speed is the train travelling?
A. 55 kmph
B. 57 kmph
C. 75 kmph
D. 63 kmph​

Answer 1

Answer:

Given :-

Total number of poles = 31

Total time = 1 minute

Distance between two poles = 50 m

$\begin{gathered} \\ \end{gathered}$

To Find :-

Speed of the Train.

$\begin{gathered} \\ \end{gathered}$

solution :-

⟼ Distance between two poles = 50 m

⟼ Distance between 31 poles = (30 × 50) m

⟼ Distance between 31 poles = 1500 m

❍ Converting the distance of 1500 m into km:

1 m = 1/1000 km

1500 m = 1500/1000 = 1.5 km

❍ Converting the time of 1 minute into hour:

1 minute = 1/60 hour

________________

We know that :

✶ Speed = Distance / Time

⟾ Speed of train = 1.5/ (1/60) km/hr

⟾ Speed of train = 1.5 × 60 km/hr

⟾ Speed of train = 90 km/hr

Thus, Speed of the Train is 90km/hr

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