A) 10 min. 20 sec.
B) 11 min. 45 sec.
C) 12 min. 30 sec.
D) 14 min. 40 sec.
Correct Answer: D
Solution :
Suppose the total time required to fill the tank is x minutes. Then, \[\frac{4}{15}+\frac{x}{20}=1\] \[\frac{x}{20}=\frac{11}{15}\] \[x=\frac{11\times 20}{15}\] \[=14\,\,\min .40\,\,sec.\]You need to login to perform this action.
You will be redirected in
3 sec