Exam Maths Puzzle Time Distance and Speed

After leaving Moose Jae, Hanson drove 100 kilometers at x km/hr and then decreased his speed by 20 km/hr and drove another 200 additional kilometers. Write a rational expression for his total traveling time.
Evaluate the expression if x=100

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Exam Other Question

How would you set up the following word problem:
You are hitting baseballs. When tossing the ball into the air, your hand is 5 feet above the ground. You hit the ball when it falls back to a height of 4 ft. If you toss the ball with an initial velocity of 25ft/sec, how much time will pass before you hit the ball?

Thanks! John like 400 but not 300; he likes 100 but not 99 ; he likes 3600 but not 3700. which he ?
a) 900
b) 1000
c) 1100
d) 1200.