a car travels first 30 km of 120 km straight track in one hour next 40 km in 30 minute and the remaining distance in 1 hour 30 minutes what is the average speed of the entire journey
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the car travels first 30 km in 1 hour means speed is 30 km per hour
then the car travel 40 km in 30 minutes means speed is 20 km per hour
total distance of the journey is 120 km
so rest of the journey = 120-40-30=50 km
so the car travels 50 km in 1 hour 30 minutes means speed is 50 ×2 / 3 km per hour
therefore average speed is [30 + 20 + 100 / 3] ÷3=250 / 9 km per hour
then the car travel 40 km in 30 minutes means speed is 20 km per hour
total distance of the journey is 120 km
so rest of the journey = 120-40-30=50 km
so the car travels 50 km in 1 hour 30 minutes means speed is 50 ×2 / 3 km per hour
therefore average speed is [30 + 20 + 100 / 3] ÷3=250 / 9 km per hour
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