CBSE Class 7 Answered
four runners starts a race together with speeds of 4km/h, 5km/h, 6km/h, 10km/h on a 30km long circular track. in what period of time they will meet together?
Asked by shubham0kumar24 | 21 Aug, 2019, 11:06: PM
Expert Answer
Time required by runners will be
7.5 hrs, 6 hrs, 5 hrs and 3 hrs respectively.
that is 450 mins, 360 mins, 300 mins and 180 mins
now they will meet at a time which will be multiple of all the four timings, that is the number will be the LCM
LCM (450,360,300,180)
Prime factorization of the numbers:
450 = 2 × 3 × 3 × 5 × 5
360 = 2 × 2 × 2 × 3 × 3 × 5
300 = 2 × 2 × 3 × 5 × 5
180 = 2 × 2 × 3 × 3 × 5
LCM(450, 360, 300, 180)
= 2 × 2 × 2 × 3 × 3 × 5 × 5
= 1800
Answered by Arun | 22 Aug, 2019, 11:13: AM
Concept Videos
-
Introduction to Fractions
This video explains the concepts of types of fractions : Unit fractions, Li... -
Addition of Fractions
This video explains the concepts of addition of fractions with same denomin... -
Introduction to Integers
Review of counting and whole numbers, evolution of integers, integers in re... -
Pair of Lines
parallel lines, transversals,corresponding angles, alternate angles,cointer... -
Solving Simple Equations
Solution of Simple linear equations in one variable using hit and trail and...
CBSE 7 - Maths
Asked by shouryavijay0020012 | 17 Apr, 2024, 03:45: PM
ANSWERED BY EXPERTCBSE 7 - Maths
Asked by archanansingh89 | 14 Apr, 2024, 03:01: PM
ANSWERED BY EXPERTCBSE 7 - Maths
Asked by pakshat261 | 14 Apr, 2024, 01:27: PM
ANSWERED BY EXPERTCBSE 7 - Maths
Asked by dineshsinghdhan9 | 11 Apr, 2024, 11:06: AM
ANSWERED BY EXPERTCBSE 7 - Maths
Asked by nabamallikasaikia346 | 11 Apr, 2024, 08:45: AM
ANSWERED BY EXPERTCBSE 7 - Maths
Asked by bpadhee | 08 Apr, 2024, 08:51: PM
ANSWERED BY EXPERTCBSE 7 - Maths
Asked by nutansharma22011 | 08 Apr, 2024, 06:13: PM
ANSWERED BY EXPERTCBSE 7 - Maths
Asked by kumbharbabu63 | 06 Apr, 2024, 12:08: PM
ANSWERED BY EXPERT
