If the replacement set is the set of natural numbers, find the solution set of
3x+4<16
7-x is less than and equal to 4x - 2
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Answered by
3
Answer:
ANSWER
Work efficiency of pump A in emptying pool =
4
1
per hour
Work efficiency of pump B in emptying pool =
6
1
per hour
∴ work done by A and B together =
4
1
+
6
1
=
24
10
per hour
Hence time taken to fill the tank 100% =
10
24
hours
∴ time taken to fill 50% =
5×100
12×50
= 1.2 hours
Since, 1hour=60minutes
∴1.2 hours= 1.2×60=72 minutes
72 minutes = (60+12) minutes = 1hour 12minutes
So, the answer is option A
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Step-by-step explanation:
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