Subject :IMO Class : Class 4

Prerna can type 90 words in 180 seconds. Find the number of words she can type in 300 seconds if she maintains a constant speed.

A100

B150

C780

D200

ans=b. Solution -90 words in 180 seconds then 1 word in how many seconds ? 180 divided by 90 =2 seconds.Then in 300 seconds how many words? 300 divided by 2= 150