1. A person travels from A to B at a speed of 40 km/hr and returns by increasing his speed by 50%. What is his average speed for both the trips?
1. 60 km/hr
2. 56 km/hr
3. 52 km/hr
4. 48 km/hr
Answer & Explanation Answer:- 4 Explanation :- Speed from A to B = 40 km/hr 2. A man in a train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, at what speed is the train travelling? Answer & Explanation Answer:- 4 Explanation :- Number of gaps between 21 poles = 20 3. A truck covers a distance of 550 metres in 1 minute whereas a train covers a distance of 33 kms in 45 minutes. What is the ratio of their speed? Answer & Explanation Answer:- 4 Explanation :- Speed of track = 550 m/per minute. 4. A person has to cover a distance of 6 km in 45 minutes. If he covers one-half of the distance in two-thirds of the total time; to cover the remaining distance in the remaining time, what should be his speed in km/hr? Answer & Explanation Answer:- 2 Explanation :- Remaing distance = 3 km 5. A man takes 5 hours 45 min in walking to a certain place and riding back. He would have gained 2 hours by riding both ways. The time he would take to walk both ways is Answer & Explanation Answer:- 3 Explanation :- Time taken to ride one way = Time taken to walk one way – 2 hours
Speed from B to A = 150% of 40 = 60 km/hr
Average speed = 2xy / (x + y) = (2*40*60) / (40*60) = 4800/100 = 48 km/h
1. 61 km/hr
2. 56 km/hr
3. 63 km/hr
4. 60 km/hr
Therefore ,
Total distance between 21 poles = 20*50 = 1000 m = 1 km
Time taken = 1min = 1/60 hr
Speed = distance/time;
Speed = 1/(1/60) =1*60 = 60km/h
1. 2 : 1
2. 1 : 2
3. 4 : 3
4. 3 : 4
Speed of bus = 33 kms /45 = 33000/45 m/minute
Ratio of their speeds = 550 : 33000/45
=> 55*45 : 3300 = 3 : 4
1. 14 km/hr
2. 12 km/hr
3. 10 km/hr
4. 8 km/hr
Remaining time = (1/3 * 45)min = 15 min = 1/4 hour.
Speed = Distance / Time
Speed = (3 / (1/4)) = 12 km/hr.
1. 11 hrs
2. 8 hrs 45 min
3. 7 hrs 45 min
4. 9 hts 20 min
Time taken to walking one way and riding back = 5 hrs 45 min
Time taken to walk both ways = 5 hours 45 min + 2 hours = 7 hours 45 min