A) 5 min
B) 8 min
C) 11 min
D) 12 min
Correct Answer: C
Solution :
\[\frac{90-60}{5}=k\left( \frac{90+60}{2}-20 \right)\]Þ \[6=k\times 55\] Þ \[K=\frac{6}{55}\] And, \[\frac{60-30}{t}=\frac{6}{55}\left( \frac{60+30}{2}-20 \right)\]Þ t = 11 minute.You need to login to perform this action.
You will be redirected in
3 sec