CAT 2017 Slot 1 QA Q7 Time, Speed & Distance

Question 7 of the Quantitative Ability (QA) section, CAT 2017 Slot 1, with CAT's official answer.

A man travels by a motor boat down a river to his office and back. With the speed of the river unchanged, if he doubles the speed of his motor boat, then his total travel time gets reduced by 75%. The ratio of the original speed of the motor boat to the speed of the river is:
  1. A
    √6 : √2
  2. B
    √7 : 2
  3. C
    2√5 : 3
  4. D
    3 : 2

Answer: (B) √7 : 2 Time, Speed & Distance MCQ

A worked solution for this question is being written. Meanwhile, practise it in a timed mock and see how other aspirants did.

Same concept in other years

See every question on Boats and streams: upstream = b − s, downstream = b + s.

More Time, Speed & Distance questions from CAT

All 48 Time, Speed & Distance questions asked since 2017.