Grandpa walks 1.5 km in 1 hour 20 minutes express speed metre per second also find how long would it take him to go from home to post office and return home if the distance between home and post offices 150 metres.
Answers
Answer:
5/16 ; 480m
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Grandpa speed is 5/16 m/s if walks 1.5 km in 1 hour 20 minutes.
Time taken is 16 mins to go from home to post office and return home if the distance between home and post offices 150 metres.
Given:
Grandpa walks 1.5 km in 1 hour 20 minutes
Distance between home and post offices 150 metres.
To Find:
Express speed meter per second
Time taken to go from home to post office and return home
Solution:
1 km = 1000m
1 hr = 3600 secs
1 min = 60 sec
Speed = Distance / Time
Step 1:
Convert 1.5 km in m
1.5 x 1000 = 1500 m
Step 2:
Convert 1 hour 20 mins in secs
1 x 3600 + 20 x 60
= 3600 + 1200
= 4800 sec
Step 3:
Use formula for speed and calculate speed
Speed = Distance / Time
Speed = 1500/4800
Speed = 5/16 m/s
Step 4:
Find to and fro distance
150 + 150 = 300 m
Step 5:
Find time
Time = Distance / speed
Time = 300/(5/16)
Time = 960 sec = 16 mins
Grandpa speed is 5/16 m/s if walks 1.5 km in 1 hour 20 minutes.
Time taken is 16 mins to go from home to post office and return home if the distance between home and post offices 150 metres.