On a rainy day, Rama was crossing a bridge. As per weather prediction wind started to blow at 5 km/hr. this caused her umbrella to fall into the river. Due to rain, the river was flowing at 125% its usual rate. She rents a motorcycle for Rs.1200 Rs an hour to chase the umbrella via road. If she recovers her umbrella at the next bridge located 5km down the river what maximum amount she will have to pay as rent, given stream usually flows at 20/9 m/s.

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