Two trains 120 m and 80 m long are running towards each other on parallel tracks at speeds of 40 km/h and 60 km/h respectively. In how much time will they completely cross each other?

In a 1 km race, A runs at a speed of 35 m/s. If A gives B a start of 50 m and beats him by 12 seconds, then the speed of B is:

The speed of a car is 20 m/s. How much distance (in km) will the car travel in 2.5 hours?

If Reena walks from her home at a speed of 3 km/h, she reaches a birthday party 20 minutes late. If she increases her speed to 4 km/h, she reaches 30 minutes early. What is the distance between her home and the party venue?