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Question

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
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B
20
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C
30
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D
40
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Solution

The correct option is B 30
Total time taken to cycle from A to B and B to A=10 minutes
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
Time taken to walk from B to A=205=15 minutes
Total time taken to walk from A to B and to walk back from B to A=15+15=30 mins.
745583_723025_ans_436a02e85ccb4c79b816033a23702651.png

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