a car sent to take a student from coaching every day . the car arrives at the coaching 15 min before the time .one day coaching gets closed one hour before the usual time .then the student without waiting for the car ,start walking towards home .on the same way he meets the car .he reaches 35 minutes before usual time .find out the time for which he keeps walking.

As the car  waits for 15 min thus if the coaching inst. closes 15 min early the boy will reach home 15 min early.
But as comes in usual time, if the coaching inst. closes 1 hr early then by reaches home 15 min early too.
But as the boy starts walking and reaches 35 min early thus he must have covered the time (35-15) min = 20 min on foot

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