Question

8. Two cyclists start from the same point on a mountain. One travels 1200 m downward the mountain
in 20 minutes, and the other travels 350 m upward the mountain in the same time. How far are they
from each other after 20 minutes?
9. The sum of two integers is -51. If one of the integers is 14, find the other integer.
10. A submarine was floating at a depth of 640 m below the sea level. If it ascends 230 metres, what
will be its new position? Express the position in terms of depth.
11. The temperature of a city drops by 15°C in one month. If the present day temperature is -4°C, what
was the temperature one month ago?​

Answer 1

Answer:

9. let one integer be x

sum of both is -51

x+14=-51

x= -51-14

x= -65

Answer 2

8. After 20 minutes they are 1550m (1200+350)m apart from eash other.

9.Let other integer = x

x+14=-51

x=-51-14 = -65

10. position of submarine = 640-230 = 410 m

11. Let temp one month ago =x

according to question

x-15=-4

x= -4+15 = 11°C