A surveyor needs to measure the distance across Lake Estell from point X to point Y. To do this he located a point Z on land so that a right AXYZ was formed. He then measured the distances from X to Z and from Y to Z. His measurements are sown on the diagram below.
X
Lake Estell
12 yd
Z
17 yd
Od = /17 - 12²
Od = V172 +12
Od = V122 - 17
Od = 17 - 12

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

(x) - (y) = (1 + 4i)

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.