Suppose it takes 45 hours for robot A to construct a new robot. Working together with robot B, it takes 25 hours for both robots to construct a new robot. How long would it take robot B to construct a new robot, working alone

56 hours 25 minutes

Step-by-step explanation:

Given:

Suppose it takes 45 hours for robot A to construct a new robot

It takes 25 hours for both robots to construct a new robot.

Question asked:

How long would it take robot B to construct a new robot, working alone ?

Solution:

Let the time taken by robot B to construct new robot =

By robot A

It takes 45 hours to construct = 1 new robot

It takes 1 hour to construct =

By robot B

It takes hours to construct = 1 new robot

It takes 1 hour to construct = new robot

By working together

It takes 25 hours to construct = 1 new robot

It takes 1 hour to construct =

new robot is constructed in = 1 hour

New robot is constructed by both working together in 1 hour = New robot is constructed by robot A in 1 hour + New robot is constructed by robot B in 1 hour

Subtracting both sides by

Thus, robot B would take 56 hours 25 minutes to construct a new robot, working alone.

answer: city needs 2.4 inches of rainfall more to match the record of 40 inches.

step-by-step explanation:

since we have given that

total annual rainfall a city record = 40 inches

this year, total rainfall recorded = 37.6 inches

number of inches of rainfall   is needed to match the record of 40 inches is given by

hence, city needs 2.4 inches of rainfall more to match the record of 40 inches.