19. Five marks exercise problems X

1. Neelaveni goes by bi-cycle to her school every day. Her average speed is \(12 \ km/hr\) and she reaches school in \(20\) minutes. What is the increase in speed, if she reaches the school in \(15\) minutes?

 

\(km/hr\)

 

2. A toy company requires \(36\) machines to produce car toys in \(54\) days. How many machines would be required to produce the same number of car toys in \(81\) days?

 

machines