two boys start from the same place, walk at the rate of 4 kilometre per hour and 4.5 km per hour respectively. how many kilometre will they be apart at the end of three and a half hours if they work in the same direction???
Answers
Given
- Two boys start from the same point
- Speed of Boy₁ = 4 km/h
- Speed of Boy₂ = 4.5 km/h
- Time = 3.5 Hours
To Find
- The distance between the two boys
Solution
☯ Here we shall use the formula : Speed = Distance/Time
★ According to the given Question :
- Speed₁ = 4 km/h
- Time = 3.5 hours
→ Speed = Distance/Time
→ 4 = Distance/3.5
→ 4 × 3.5 = Distance
→ Distance = 14 km
- Speed₂ = 4.5 km/h
- Time = 3.5 hours
→ Speed = Distance/Time
→ 4.5 = Distance/3.5
→ 4.5 × 3.5 = Distance
→ Distance = 15.75 km
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● Distance Between the two boys will be the difference between the distance covered by boy₁ & boy₂
→ Distance Between the boys = Boy₂ - Boy₁
→ Distance Between the boys = 15.75 - 14
→ Distance Between the boys = 1.75 km
Step-by-step explanation:
Given :
- two boys start from the same place, walk at the rate of 4 kilometre per hour and 4.5 km per hour respectively.
To Find :
- how many kilometre will they be apart at the end of three and a half hours if they work in the same direction???
Solution :
According to the Question :
Concept :
- Distance equals speed times time. Rate and speed are similar since they both represent some distance per unit time like miles per hour or kilometers per hour. If rate r is the same as speed s, r = s = d/t.
_____________________
Distance Between the boys = ( Distance/Time )₂ - ( Distance/Time)₁
Substitute all Values :
Distance Between the boys :
( 4.5 = Distance/3.5 ) - ( 4 = Distance/3.5 )
Distance Between the boys :
( Distance = 15.75km) - ( Distance = 14 km )
Distance Between the boys :
Distance = 1.75 km
- Hence the distance 1.75km