A train takes 1 hour 20 minutes to travel between two stations, P and Q. If it travels at $$\frac{5}{6}$$ of its usual speed,how long will it take to travel between P and Q?
Let the speed of the train is 6 unit.Â
Decreased speed =Â $$6\times\ \frac{5}{6}=5\ unit$$
Speed ratio = 6 : 5Â
We know, time is inversely propotional to time.
Time ratio = 5 : 6
5 unit = 1 hr 20 min = 80 min
1 unit =Â $$\frac{80}{5}=\ 16$$
Required time = 6 unit
i.e; $$16\times\ 6=96\ \min=\ 1hr\ 36\ \min$$
Hence, Option C is correct.Â
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