12. Physics 1999]
When a small lamp is held 1.5 m above the surface of
water in a tank, its image formed by reflection at the
surface appears to coincide with the image of the bot-
tom of the tank. (u of water = 4/3). The depth of the
tank is
(a) 2 m
(b) 1.5 m
(c) 1 m
(d) 4 m.

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min