Answer:
After 18.32 seconds washer men will be at the same height.
Explanation:
Given question is incomplete; here is the complete question.
Two window washers start at the heights shown. (A: 21 ft high rising 8 in per second. The other is 50 feet high descending 11 inches per second) one is rising one is descending. How long does it take for the two window washers to reach the same height? Explain
Two window washers are moving in opposite directions.
First window washer is at 21 ft and rising with the speed of 8 inches per second.
Second window washer is at 50 feet and descending with the speed of 11 inches per second.
Since 1 feet = 12 inches
Therefore, 21 feet = 21×12 = 252 inches
Similarly, 50 feet = 50 × 12 = 600 inches
Let both the window washer takes 't' time to be at the same height.
Height of the first window washer after t seconds = (252 + 8t) feet
Height of the second window washer after t seconds = (600 - 11t) feet
Since both are at the same height after time 't',
(252 + 8t) = (600 - 11t)
8t + 11t = 600 - 252
19t = 348
t = 18.32 seconds
Therefore, after 18.32 seconds washer men will be at the same height.