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# Answer to Question #214615 in Civil and Environmental Engineering for syra

Question #214615
A man drives for 30 minutes at a speed of 25m/s, then stops for 10 minutes, and finally drives for 20 minutes at 36 m/s. Calculate (a) the total distance traveled and (b) the average speed
1
2021-07-12T03:36:18-0400

Part a

He firstly travels for 30 mins at 25 m/s

i.e. he travels for "30 \\times 60 = 1800 seconds"

The distance he travels will be "1800 \\times 25 =45000 m (45 km)"

His second set of travelling is for 20 minutes at 36 m/s

i.e. he travels for "20 \\times 60 = 1200 seconds"

The distance he travels will be "1200 \\times 36 = 43200 m (43.2 km)"

The total distance he travels will be "45000 + 43200 = 88200 m."

Part b

This means his average speed as the overall journey took one hour is

"S= \\frac{D}{T}= \\frac{88200}{3600} = 24.5 m\/s\\\\"

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