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
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
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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