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X and Z go on a bike ride starting early morning facing the opposite direction of the Sun. They approach a cross road. Z takes the left turn and Y goes to the right. After travelling for 1 km, Y turns 45^(@) to his right to reach a cross road. In which direction is Y heading ?

A biconvex lens, f_(1)=20cm , is placed 5cm in front of a convex mirror, f_(2)=15cm . An object of length 2 cm is placed at a distance 10cm from the lens. Find the loaction and nature of the final image after the leftward travelling rays once again pass through the lens. Find overall magnification.

Solve the following Word Problems : Places A and B are 300 km apart and they are on a straight road . Hamid travels from A to B on bike . At same time joseph starts from B on bike, travels towards A . They meet each other after 20 minutes . If Joseph would have started from B at same time but in the opposite direction ( instead of towards A ) . Hamid would have caught him after 3 hours . Find the speed of Hamid and Joseph .