Question

4. A man travels first 900 km of his journey by train at an average speed of 80 km per
hour
next 2000 km by plane at an average speed of 300 km per hour and finally 20 km by taxi
at an average speed of 30 km per hour. What is his average speed for the entire journey​

Answer 1

answer:157 29/223

Step-by-step explanation:

formula for taking out average speed is total distance / total time

time he took to travel 900 km at the rate of 80kmph=900/80= 90/8 hours

Next, time he took to travel 2000 km at the rate of 300kmph= 2000/300 =20/3 hours

Finally, time he took to travel 20 km at the rate of 30kmph=2/3h

total distance he covered = 900+2000+20km = 2920km

Total time he took = 90/8+20/3+2/3 which is same as 270/24+160/24+16/24= 270+160+16/24= 446/24

Average speed for the total journey = 2920*24/446=35040/223 = 157 29/223

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