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Q18.Sharmila takes the office bus home every day in the evening. She takes the five o' clock bus and gets off exactly at six o' clock at the bus stop nearest to her house. Her husband driving from home picks her up at the bus stop, and they drive back home. One day Sharmila decided to take the four o' clock bus and reached her bus stop at five o' clock. Thinking that her husband won't be able to pick her up earlier than usual, she decided to walk home. At some point during her walk, her husband picked her up and they reached home ten minutes earlier than they usually reach home. Assuming that Sharmila's husband always drives at a constant speed, and that on this occasion he left home as usual, how long (in minutes) Sharmila walked before she was picked up?
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Q20.A greenhouse constructed in the shape of a hemi-spherical dome houses a cuboid structure as shown in the given figure. The top four corners of the cuboid just touch the inside of the hemi- sphere. The diameter of the hemi-sphere is 20 m. The centre of the base of the cuboid and the centre of the base of the hemi-sphere coincide. A ladder AB is placed from one corner of the cuboid as indicated by the point B, reaching the centre of the top surface of the cuboid as indicated by the point A. What is the length of the ladder AB?
A 3 x 3 grid as shown in figure 1 is to be filled with numbers 1 to 9 according to the following rules: - 8 is above 9 and to the right of 2 - 3 is to the right of 7 and above 9 which is to the left of 4 - 2 is to the left of 5 - 7 is above 6 and 2 - 1 is above 5 - 'To the left of' or 'to the right of' means in the same row - 'Above' or 'below' means in the same column What is the sum of the three numbers in the middle row?
