How long did Aakash walk?
Explanation:
The driver saved 40 minutes while travelling both ways. ⇒ He saved 20 minutes one way.
∴ Driver must have picked Aakash 20 minutes before normal time i.e., at 6:40 pm.
⇒ Aakash walked from 5 pm till 6:40 pm.
∴ Aakash walked for 100 minutes.
Hence, option (c).
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