A train met with an accident 3 hours after starting, which detains it

A train met with an accident 3 hours after starting, which detains it for one hour, after which it proceeds at 75% of its original speed. It arrives at the destination 4 hours late. Had the accident taken place 150 km further along the railway line,
the train would have arrived only 3 1 hours late.
2
Find the length of the trip and the original speed of the train.

1100 km ; 100 kmph

1200 km ; 100 kmph

1200 km ; 90 kmph

1600 km ; 90 kmph

Answer» C. 1200 km ; 90 kmph

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