How to calculate distance ratio with momentjs and turfjs

Hello,
With JS anf turfjs library I need on several markers calculate
1) medium speed
2) time of arrival at any marker point

I make as:

    const markerIds = Object.keys(markers)
    const points2Data = []

    let summarized_distance= 0
    let arrival_date= moment(tripRow.arrival_date)// arrival time
    let departure_date= moment(tripRow.departure_date) // departure time

    for (let i = 1; i < markerIds.length; i++) {
      const marker = markers[markerIds[i - 1]]...

Code (JavaScript):

How to calculate distance ratio with momentjs and turfjs

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