Question

When the speed of a train is increased by 20%, it takes 20 min less to cover the same distance. What is the time taken to cover the same distance with the actual speed?

• A. 2h
• B. 1h
• C. 1.5h
• D. 2.5h

Answer 1

The correct option is A 2h

Using product stability ratio method : D = S $\times$ T
Since speed has been increased by 20% or $\frac{1}{5}$, so time will reduce by $\frac{1}{6}$.
Now, $\frac{1}{6}$ of T (Time) = 20 min
T = 120 min = 2h