有幾條數唔識做丫

1.A sum of $16000 is divided between wilson and sherman in the ratio of 4:6.How much money does wilson get?
Wilson gets
=16000 * 4/(4+6)
=16000 * 4/10
=6400
Wilson gets $6400.
2.Henry walked home from school in 30 minutes at an average speed of 60m/min.If he walked at a speed 100m/min in the initial 1000m.what was his walking speed for the remaining journey?
The distance between home and school
=30 * 60
=1800m
The time of the remaining journey
=30 - 1000/100
=30 - 10
=20min
His walking speed for the remaining journey
=(1800-1000) / 20
=800 / 20
=40m/min

1.$6400

2.40m/min

1) The money wilson gets = $16000 * 4 / ( 4 + 6 )
= $ 6400

2) velocity = distance / time used
The total distance from the school to home = 30 mins * 60 m/mins = 1800 m
For the first 1000m journey , the time used = 1000 m / (100 m/min) = 10 mins

For the remaining journey , the distance = 1800m - 1000m = 800m
the time used = 30 mins - 10 mins = 20 mins
the required walking speed = 800m / 20mins = 40m/min

A) $16000 x 4/10 = WISLON 因$16000中有4份係WILSON 同6份係SHERMAN

B) 30MINS X 60M/MINS 係全程的長度=1800M; 頭1000M段100M/MINS行(1000M OVER 100M/MINS = 用了10MINS), 即尾段剩800M (1800M-1000M), 而仲有20MINS剩,(因他平時只有30MINS, (800M OVER 20 MINS = 40M/MINS)

1)the money wilson gets= 4/4+6 *16000
=$6400