Answer :
Given: Speed of train = 75kmph
To Find: Distance Travelled in 20 minutes, Time required to cover 250km.
Formulation: Speed of the train is 75kmph, i.e, it requires 1 hour (60 minutes) for the train to cover 75km.
Formula: 
(i) Substituting x1 = 60 y1 = 75 and x2 = 20 in the formula,
Gives y2 = 25 km
∴The train will move 25km in 20 minutes
(ii) Substituting x1 = 60 y1 = 75 and y2 = 250 in the formula,
Gives x2 = 200 minutes or 3 hours 20 minutes
∴The time required to cover a distance of 250km is 3 hours 20 minutes.
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