1) A train starts from station X at the rate of 80 km/hr and reaches station Y in 48 min. If the speed is reduced by 8 km/hr. How much more time will the train take to return from station Y to station X ? A) 2 min 15 sec B) 2 min 10 sec C) 3 min 20 sec D) 5 min 20 sec E) 4 min 20 sec Answer: Option DExplanation:Distance $xy$ $=\frac{80\times 48 }{60}=64$ New Speed $=80-8=72$ km/hr Time taken $=\frac{64 }{72}\times 60$ $=53\frac{1 }{3}$ min Extra time taken $=53\frac{1 }{3}-48$ $=5\frac{1 }{3}$ = 5 min 20 sec
