question_answer

Chinki can cycle from point A to point B and return to point A in 10 minutes. She can cycle there and walk back in 20 minutes. it will take ______ mins for her to walk there and walk back.

A)  10                               

B)  20                   

C)  30                   

D)         40                   

Correct Answer: C

Solution :

Total time taken to cycle from A to B and B to A = 10 minutes \[\therefore \]Time taken to cycle from A to B =5 minutes Total time taken to cycle from A to B and to walk back from B to A = 20 minutes i.e. 5 + Time taken to walk from B to A = 20 \[\Rightarrow \]Time taken to walk from B to  A = \[20-5=15\] minutes \[\therefore \] Total time taken to walk from A to B and to walk back from B to A \[=15+15=30\]mins.