Surbhi was travelling to point B from point A with speed of 45 km/hr. After 1 hour, Pragati also started to travel from point A to point B. Pragati reached the point B 30 minutes before Surbhi. If Pragati would have decreased his speed by 6 km/hr then both would have reached point B at the same time. Find the original speed of Pragati. 

1
55 km/hr
2
54 km/hr
3
56 km/hr
4
64 km/hr
5
60 km/hr

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