Sep 242015

A person rides a cycle at a constant speed.

When he drives in the direction of the wind, he is able to go 35 km in 5 hrs. While returning, when the wind was against the direction of his driving, he took 7hrs for the same distance.

At what speed does he rides when there is no wind?
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Jun 132012

Two friends decided to get together and start riding bikes towards each other, both at a speed of 6 km/hr (starting at the same time). The live 36 km apart and hence will meet halfway.

One of them have a pet pigeon and it starts flying the instant the friends start traveling. The pigeon flies back and forth between the two friends, at a speed of 18 km/hr until the friends meet.

How much distance (in km) will the pigeon travel? Continue reading »