A clerk in a bank counter can serve 10 customers in half an hour. At this rate how many customers can the clerk serve in 2.5 hours?

Question: A clerk in a bank counter can serve 10 customers in half an hour. At this rate how many customers can the clerk serve in 2.5 hours?

Solution:
Given that,
In 0.5 hour (half an hour), the clerk can serve = 10 customers
In 1 hour, the clerk can serve = (10/0.5) customers
= 20 customers

Now, in 2.5 hours, the clerk can serve = (20 × 2.5) customers
= 50 customers

∴ The clerk can serve 50 customers in 2.5 hours