Question

Speed of a car is 85km/hr for the first 15 minutes
and 60km/hr for the next 20 min. What is the
distance covered by the car? Find its average
speed. Express it in metres per second.​

Answer 1

Answer:

Distance = 41.25 km

Average speed= 72.5km/h

Speed in m/s= 20.14 m/s

Explanation:

• Speed = distance ➗ time
• Distance= speed ✖ time
• Therefore;

85km/hr ✖ 15 minutes = 21.25 km

60km/hr ✖ 20 minutes = 20 km

Total distance = 41.25 km

• Average speed= total distance covered ➗ total time taken
• Therefore;

distance = 41.25km

time = 35 minutes

41.25km ➗ 35 minutes

= 72.5km/h

• To convert the speed to m/s, we divide by 1000/3600
• Therefore;

72.5km/h ➗ 1000/3600

= 20.13888888888(round off)

= 20.14 m/s

I HOPE YOU UNDERSTAND.

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