Math, asked by venkatghuge, 9 months ago

20 Mathematics Scholarship Examination for std: 6
(15) A motorist travels 90 kms distance with the speed of 60 kms/hr and the next 40 kms
distance with the speed of 40 kms/hr. What is his average speed during the journey

Answers

Answered by philipelbert7
0

Answer:

52

Step-by-step explanation:

let a = his average speed for the journey

The total distance is 90 + 40 = 130 km

Write a time equation; Time = dist/speed

90/60 + 40/40 = 130%2Fa

1.5 + 1 = 130/a

2.5a = 130

a = 52 km/hr

Answered by vishnuvardhan88
0

Answer:

52 kmph

Step-by-step explanation:

time taken for 1st 90 kms = 90÷60 =1.5hr

2nd 40kms = 40÷40 = 1 hr

TOTAL TIME TAKEN = 2.5 hr

avg speed = total distance÷total time taken

=130÷2.5

= 52 kmph

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