A train has an average speed of 50km/hr over 150 km and it travels at variable speed throughout its journey. The train travels slowest when it crosses a platform with a constant speed. The train is 100m long and the platform is 1250 m long. If the train takes 10minutess to cross the platform, what is the speed of the train during the rest of the journey?

A train has an average speed of 50km/hr over 150 km and it travels at variable speed throughout its journey. The train travels slowest when it crosses a platform with a constant speed. The train is 100m long and the platform is 1250 m long. If the train takes 10minutess to cross the platform, what is the speed of the train during the rest of the journey?
1). 52.5 km/hr
2). 60 km/hr
3). 54.3 km/hr
4). 63.5 km/hr

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