Time and work

1.How many minutes Rama will take to cover a distance of 500 meters if he runs at a speed of 20 km/hr ? A)40 min B)45 min C)50 min D)35 min Answer : Option A Explanation: ⇒ Rama's speed = 30 km/hr = 30 Ũ 5/18 = 25/2 m/sec ⇒ 500 Ũ 2/25 = 40 mins 2. Speed of a train is 30 meters per second. It can cross a pole in 15 seconds. What is the length of train ? A)400 m B)430 m C)450 m D)460 m Answer : Option C Explanation: ⇒ Lenght of train = 30 Ũ 15 = 450 meters 3. A car running at 55 km/h takes one hour to cover a distance. If the speed is reduced by 5 km/hour then in how much time it will cover the distance ? A)64 min B)66 min C)65 min D)68 min Answer : Option B Explanation: ⇒Reduced speed = 55-5 = 50 km/h ⇒ Now car will take 55/50 Ũ 60 mins = 66 mins 4.In a kilometer race, A beats B by 100 meters. B beats C by 100 meters. By how much meters does A beat C in the same race ? A)180m B)170m C)175m D)190m Answer : Option D Explanation: ⇒ While A covers 1000 meters, B can cover 900 meters ⇒ While B covers 1000 meters, C can cover 900 meters ⇒ Lets assume that all three of them are running same race. So when B runs 900 meters, C can run 900 Ũ 9/10 =810 ⇒ So A can beat C by 190 meters.

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