The ratio of speed of two trains Z & X is 7 : 9. If train Z takes 12 minutes more than train x to cover a certain distance , then how much time (in minutes) will X take to cover the same distance ?
Answer & explanation
Correct answer: option 1
Distance = Speed × Time
So, ratio of speed to time is inverse to each other .
Z : X
Speed 7 : 9
Time 9 : 7
According to question ,
( 9 - 7 )R = 2R = 12 minutes
1R = 6 minutes
So, Time taken by x → 7 × 6 = 42 minutes