Question

rambhau started the water pump at ten thirty at night and put it off the same night at a quarter to twelve. how long was the water pump on?

Answer 1

25 hour 15 minutes.......

Answer 2

Hence the water pump on for 1 hour 15 minutes.

Step-by-step explanation:

Given:

Water pump started at night at 10 hours 30 minutes,

⇒ $(10\times 60)+30$        [1 hour = 60 minutes]

= 600+30

= 630 minutes  

Water pump put off at same night at  quarter to twelve means 11 hours 45 minutes,

⇒ $(11\times 60)+45$        [1 hour = 60 minutes]

= 660+45

= 705 minutes

Now the total time the water pump was put on,

⇒ put off time - put on time

= 705 - 630

= 75 minutes

= 60 minutes + 15 minutes            [1 hour = 60 minutes]

= 1 hour 15 minutes

Hence the water pump on for 1 hour 15 minutes.