Question

Pipes A and B can fill a tank in 20 hours and 30 hours respectively. If both the pipes are opened
simultaneously, how much time will it take for
the take to get full?
of
Select one:
O a. 10hrs
b. 15hrs
O c. 12hrs
d. 25hrs
e. 20hrs
In an examination, a student scores 4 marks for every correct answer and loses 1 mark for
every wrong answer. If he attempts in all 60 questions and secures 130 marks, the number of
questions he attempts correctly is:
of​

Answer 1

Answer:

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Answer 2

Answer:

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Step-by-step explanation:

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