GRE Exam Numerical Ability Time Distance and Speed

a is twice as fast as b and b thrice as fast as c is the jouney covered by c in 42 min. will be covered by a in

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GRE Other Question

If a train runs at 40 kmph, it reaches its destination late by 11 min but it if runs at 50 kmph it is late by 5 min. only the correct time for the train to cover its journey is A certain distance is covered at a certain speed. if half of the distance is covered in double the time the ratio of the two speeds is