Question

ramtook 4hours to complete the last 1/4 part of journey at an average speed of 55km/hr.his average speed ofor the whole journey is 60km/hr.how long will it take to cover the first 3/4part of the journey​

Answer 1

Step-by-step explanation:

Given Ram took 4 hours to complete the last 1/4 part of journey at an average speed of 55 km/hr. his average speed for the whole journey is 60 km/hr. how long will it take to cover the first ¾ part of the journey

• According to question,
• Ram took 4 hrs to complete last 1/4 part of journey at 55 km / hr
•                                                                       = 55 x 4
•                                                                        = 220 kms
• We need to find the speed f first 3/4 part of journey.
• So let s be the speed for 3/4 first part of journey.
• Now 55 x 1/4 + s x 3/4 = 60
• 55 + 3x / 4 = 60
• 3s = 240 – 55
• 3s = 185
• Or s = 185 / 3 km / hr
• Total journey = 880 kms
• But 880 – 220 = 660 kms

Now time taken for 3/4 first part will be 660 / 185 / 3

                                                          = 10.70 hrs

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