A tap can fill half of a cistern in 30minutes.How long will it take to fill 3/4th of the cistern
Il be grateful if you can help me..My brain is not really working these days,I need to submit this assignment by tomorrow so please help
Answers
Answered by
0
Answer:
12. A tap can fill a tank in 4 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
A. 1 hr 30 min B. 2 hr 30 min
C. 2 hr D. 3 hr
Answer: Option B
Explanation:
Solution 1
A tap can fill a tank in 4 hours.
Therefore the tap can fill half the tank in 2 hours.
Remaining part
=
1
2
After half the tank is filled, three more similar taps are opened.
Hence, total number of taps becomes 4.
Part filled by one tap in
1
hour
=
1
4
Part filled by four taps in 1 hour
=
4
×
1
4
=
1
i.e.,
4
taps can fill remaining half in
30
minutes.
Total time taken
=
2
hour +
30
minute =
2
hour
30
minutes
Similar questions