Advertisements
Advertisements
प्रश्न
A watch which gains uniformly is 2 minutes slow at noon on Monday and is 4 minutes 48 seconds fast at 2 p.m on the following Monday. When was it correct?
विकल्प
2 p.m. on Tuesday
2 pm on Wednesday
3 pm on Thursday
1 p.m. on Friday
Advertisements
उत्तर
2 pm on Wednesday
Explanation:
Time from 12 pm on Monday to 2 pm on the following Monday = 7 days 2 h
So, the watch gains`=2+4 48/60 "min".`
`=6 4/5 "min".`
`34/5` min in 170 h
Now, `34/5` min are gained in 170 h.
∴ 2 min is gained in `70xx5/34xx2`
= 50 h = 2 days 2 hours
So the watch is correct 2 days 2 h after 12 pm on Monday i.e. It will be correct at 2 pm on Wednesday.
APPEARS IN
संबंधित प्रश्न
A train 600 meters long is running at a speed of 90 kms/hr. If it crosses a tunnel in one minute, then the length of the tunnel is:
Choose the most appropriate option.
A boat travels upstream from A to B and back from B to A in 5 hours. The speed of the boat in still water is 8 km/hour and the speed of the current is 4 km/hour. Then, the distance from A to B is:
If a person travels at a speed of 40 km/h he will reach his destination on time. He covered half the journey in `2/3` of the time. At what speed (in km/h) should he travel to cover the remaining journey to reach the destination on time?
A man can row 14 km/hr in still water. ln, the stream flowing with the speed of 10 km/hr he takes 4 hours to move with the stream and come back. Find the distance he rowed the boat.
A person takes 3 hours to walk a certain distance and riding back. He could walk both ways in 5 hours. How long could it take to ride both ways.
A train 300 meters long is running at a speed of 25 meters per second, it will cross a bridge 200 meters long in
A person crosses a 600m long street in 5 min. What is his speed in km per hour?
Two trains of equal length are running on parallel lines in the same direction at 46 km/h and 36 km/h. The faster train passes the slower train in 36 s. The length of each train is
A man covers half of his journey as 6 km/h and the remaining half at 3 km/h. His average speed is
Two cyclists start simultaneously from two points A and B, their destinations being B and A, respectively. After crossing each other, they precisely take 2 hours 33 minutes 36 seconds and I hour 26 minute 24 seconds respectively to reach their destinations. What is the ratio of the speed of the first to that of the second cyclist?
