A motorbike goes from A at 8h30' to B 9h42'. The distance between A and B is 60 km. Calculate the speed of the motorbike.

Class 5A is going to grow 180 trees. Now they have grown 45% number of trees. How many trees are class 5A have to grow more?

A store sells rice. On the 1^st day, the store sold \(\dfrac{2}{3}\) kilograms of rice. On the 2^nd day the store sold \(\dfrac{1}{3}\) kilograms of rice left. At last, the store got 30 kg of rice left . How many kilograms of rice does the store have at first?

The AB road is 25 km long. On the from A to B, a person walk for 5km and then drive a car in half an hour to come to B. Calculate the speed of the car.

A worker works from 7.30 to 12 o'clock and has made 3 tools. How much time does he take to make a tool?