In this task, you need to answer the given multiple-choice question on the physics. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Q: Problem: a constructor estimates that 3 people can paint mr khans house in 4 days . if he uses 4 people instead of 3 , how long will they take to complete the job ? 
Options: a ) 2 , b ) 8 , c ) 1 , d ) 3 , e ) 4

A: d
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Q: Problem: 225 metres long yard , 26 trees are palnted at equal distances , one tree being at each end of the yard . what is the distance between 2 consecutive trees 
Options: a ) 10 , b ) 12 , c ) 14 , d ) 16 , e ) 17

A: a
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Q: Problem: a goods train runs at the speed of 72 km / hr and crosses a 280 m long platform in 26 sec . what is the length of the goods train ? 
Options: a ) 240 , b ) 277 , c ) 276 , d ) 270 , e ) 281

A:
a
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