48. A lorry starts from Banglore to Mysore at 6.00 A.M, 7.00 A.M, 8.00 am…..10 pm. Similarly one another starts from Mysore to Banglore at 6.00 am,7.00 am, 8.00 am…..10.00pm. A lorry takes 9 hours to travel from Banglore to Mysore and vice versa.
(i) A lorry which has started at 6.00 am will cross how many lorries.
 Ans: 10.
(ii) A lorry which had started at 6.00pm will cross how many lorries.

49. A person meets a train at a railway station coming daily at a particular time . One day he is late by 25 minutes, and he meets the train 5 k.m. before the station. If his speed is 12 kmph, what is the speed of the train
Ans:

60 kmph. Refer–Shakuntala Devi Book

50. A theif steals half the total no of loaves of bread plus 1/2 loaf from a backery. A second theif steals half the remaing no of loaves plus 1/2 loaf and so on. After the 5th theif has stolen there are no more loaves left in the backery. What was the total no of loaves did the backery have at the biggining

31

51. From a vessel, 1/3rd of the liquid evaporates on the first day. On the second day 3/4th of the remaining liquid evaporates. What fraction of the volume is present at the end of the second day

50%.

52. There is a 4 inch cube painted on all sides. This is cut down into of 1 inch cubes. What is the no of cubes which have no pointed sides?
Ans:

8

53. Sam and Mala have a conversation. Sam says I am certainly not over 40. Mala says I am 38 and you are atleast 5 years older than me. Now, Sam says you are atleast 39. All the statements by the two are false. How old are they really?

Ans:

Mala = 38 yrs; Sam = 41 yrs.