Question

pls answer its really urgent​

Answer 1

Explanation:

85 km/hr

1 hr = 60 min

distance 1 = 85 × 15/60 = 21.25 km

distance 2 = 60 × 20/60 = 20 km

total distance = 21.25 + 20 = 41.25 km

total time = 15 + 20 = 35 min

average speed = total distance/ total time = (41.25/35) × 60 ~ 70.7 km/hr

Answer 2

Given :

• Speed of car for first 15 minutes = 85km/h
• Speed of car for next 20 minutes = 60kmph

To find :

• Total distance traveled
• Average speed in m/s

Formula used :

Speed = Distance ÷ time

Solution :

Firstly we need to find out the distance traveled by car in first 15 minutes

➝ Distance traveled by car in first 15 minutes = Speed for first 15 minutes × time in hour

➩ Distance traveled by car in first 15 minutes = 85 km/h × (15/60)h

➩ Distance traveled by car in first 15 minutes = 85 km/h × (1/4)h

➩ Distance traveled by car in first 15 minutes = 85 × 0.25 km

➩ Distance traveled by car in first 15 minutes = 21.25 km

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Now we need to find distance traveled by car in next 20 minutes

➝ Distance traveled by car in next 20 minutes = Speed of car in next 20 minutes × time in hour

➩ Distance traveled by car in next 20 minutes = 60km/h × (20/60)h

➩ Distance traveled by car in next 20 minutes = 60 × 20/60 km

➩ Distance traveled by car in next 20 minutes = (60/60)×20km

➩ Distance traveled by car in next 20 minutes = 20km

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Therefore,

➝ Total distance traveled by car = Distance traveled by car in first 15 minutes + Distance traveled by car in next 20 minutes

➩ Total distance traveled by car = 21.25km + 20km

Total distance traveled by car = 41.25 km

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➝ Average speed of car in m/s = Total distance traveled in metre ÷ total Time taken in second

➩ Average speed of car in m/s = (41.25 × 1000)m ÷ [ ( 15 + 20)×60 ] s

➩ Average speed of car in m/s = 41250m ÷ (35× 60)s

➩ Average speed of car in m/s = 41250m ÷ 2100s

➩ Average speed of car in m/s = 19.64 m/s

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ANSWER :

• Total distance traveled = 41.25 km
• Average speed in m/s = 19.64 m/s