How long will John take to make a round of a circular field of radius 21 m cycling at the speed of 8 km/hr?

How long will John take to make a round of a circular field of radius 21m cycling at the speed of 8km/hr ?

How long will a man take to make a round of a circular field of radius 21 m, cycling at the speed of 8 km//h ?

8.How long would a boy take to walk once round a circular park whose diameter is 420m if his speed is 3km/h

How long will a man take to go, walking at 13.2 km/h , round a circular garden of 700 m radius ?

Calculate the angular speed of a car which rounds a curve of radius 8 m at a speed of 50 km/h.

A train 300 metres long is running at a speed of 90 km/hr. How many seconds will it take to cross a 200 m long train running in the opposite direction at a speed of 60 km/hr. ?

A park is 1500 metres long and 750 metres wide. A cyclist has to take four rounds of this park.How much time will he take at the speed of 4.5 km/hr?