A postman riding a bicycle at 15 km per hour reach a village in 4 hrs. If he is delayed by 1
A postman riding a bicycle at 15 km per hour reach a village in 4 hrs. If he is delayed by 1 hour at the start, then in order to reach his destination in time, he should ride with a speed of :
20 kmph
24 kmph
27 kmph
21 kmph
28 kmph