A cyclone is a violently rotating mass of air in the atmosphere. The approximate height of this air can be which of the followings?
A bike travels 80 km with the speed of 40 kmph and another 60 km with the speed of 30 kmph. Find the average speed of the bike.
Ordinary air from the atmosphere contains about 21% of oxygen whereas the dissolved air in river water contains about 30%. Give a reason for this.
A truck travelling with 45 of its actual speed covers 56 km in 1 hr 45 mins. What is the actual speed of the truck?