Laxman joins Saurav and Sachin and all of them run on a circular track of length 500 m in the same direction from the same point simultaneously. Laxman moves at 3 km/hr, Sachin at 5 km/hr and Saurav at 8 km/hr. When will they all be together again for the first time?
(a) After 45 min (b) After 30 min (c) After 15 min (d) After 1hour
Two motorists Anil and Sunil are practicing with two different sports cars: Ferrari and Maclarun, on the circular racing track, for the car racing tournament to be held next month. Both Anil and Sunil start from the same point on the circular track. Anil completes one round of the track in 1 minute and Sunil takes 2 minutes to complete a round. While Anil maintains same speed for all the rounds, Sunil halves his speed after the completion of each round. How many times Anil and Sunil will meet between the 6th round and 9th round of Sunil (6th and 9th round is excluded)? Assume that the speed of Sunil remains steady throughout each round and changes only after the completion of that round.
(a) 260 (b) 347 (c) 382 (d) None of the above
Doubts in the following questions...
Though these are easy ones...plz explain the method...
http://i.imgur.com/8TWHFI6.jpg
http://i.imgur.com/fgLF3H3.jpg
http://i.imgur.com/3dWdaVl.jpg
Two clocks show the same time at 4 p.m. The first clock loses 10 min every 2 hr and the second gains 10 min every hour. When will they both show the same time again?
(a) After 18 hour (b) After 9 hour (c) After 48 hour (d) After 24 hour
P and Q start running in opposite directions (towards each other) on a circular track starting at diametrically opposite points. They first meet after P has run for 75 meters and then they next meet after Q has run 100 meters after their first meeting. Assume that both of them are running at a constant speed. The length of the track (in meters) is.
(a) 70 (b) 175 (c) 250 (d) 350
There are two clocks, both set to show the correct time at 10 a.m. One clock gains two minutes in one hour while the other gain one minute in one hour. If the clock which gains 2 minute shows the time as 22 minute past 9 p. m. On the same day, then what time the other watch show?
(a) 9 hrs. 33 min. (b) 9 hrs. 12 min. (c) 9 hrs. 11 min. (d) 9 hrs. 23 min.
If the time in a clock is 6 hours 45 minutes, then what time does it show on the mirror?
(a) 4 hrs. 15 min. (b) 5 hrs. 45 min. (c) 5 hrs. 15 min. (d) 5 hrs. 30 min
Has anyone given the Vistamind free mock that is currently going on? How is the quality of the mock? Is it worth attempting?
What is the coefficient of x^204 in (x-1)(x^2-2)(x^3-3).....(x^20-20) ?
In a 100 M race, if A gives B a start of 20 meters, then A wins the race by 5 seconds. Alternatively, if A gives B a start of 40 meters the race ends in a dead heat. How long does A take to run 200 M?
(a) 10 seconds (b) 20 seconds (c) 30 seconds (d) 40 seconds