A school has 9 periods a day each of 50 minutes duration. How many period will there be. if the duration of every period is reduced by 5 minutes?

A machine can fill 420 bottles of mineral water in 3 hours. How many bottles can be filled in 5 hours?

In a model of a ship, the mast is 9 cm high, while the mast of the actual ship is 12 m high. If the length of the model ship is 21 cm, then how long is the actual ship?

If 5 kg of sugar contains 2.25 x10⁷ crystals. How many sugar crystals are there in 2 kg of sugar?

A 10 m 50 cm high vertical pole casts a shadow 6 m long. Find at the same time the length of the shadow cast by another pole 5 m 60 cm high.

A loaded truck travels 168 km in 5 hours. How far can it travel in 25 minutes?

A farmer has enough food to feed 30 animals in his cattle-farm for 4 days. How long would the food last if there were 10 less animals in his farm?

4 persons can build a room in 3 days. If there are only 3 persons to be engaged in the building task, then how long should they take to complete the task?

89.

If 20 bottles can be packed in 15 boxes. Then how many bottles of the same batch can be packed in each box when there are 25 boxes?

 A car takes 1.5 hours to reach a destination by travelling at the speed of 80 km/h. How long will it take when the car travels at the speed of 60 km/hr?