Three Gorges Mathematics People's Education Edition Wuhan

Question 3:

Solution: Let Robot B carry X kilograms per hour and Robot A carry x+30 kilograms per hour.

900/(x+30) = 600/x Solution: x=60.

A: Type A robots carry 90 kilograms per hour, while Type B robots carry 60 kilograms per hour.

Question 7:

Solution: Let the climbing speed of the second group be x meters per minute. Then the second group is1.2x.

450/x = 450/1.2x+15 solution: x=5 answer: the first group is 6m/min；; The second group is 5m/min.

Let the climbing speed of the second group be x meters per minute. Then the second group is ax.

H/x=h/ax+t solution: x=h/t*( 1- 1/a)

A: the first group is h/t * (a-1) m/min; The second group is h/t*( 1- 1/a) m/min.