Rachit took 4 hours to complete the last one fourth part of a journey at an average speed of 55 km per hour is average speed for the whole journey is 60 km per hour how long it will take to cover the first three by fourth part of the journey
17 Question

last 1/4 of journey=55*4=220kms
total journey=880 kms
speed of first 3/4 part of journey=?
55*1/4 +x*3/4 =60 where x is speed for the 3/4 first part of journey
x=185/3 km/hr
time taken for 3/4 first part=660/(185/3)=10.70 hours
 

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