Question

A car moves with a speed of 40 km/h for 15 minutes and then with a speed of
60 km/h for the next 15 minutes. Find the total distance covered by the car in
these 30 minutes.
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Answer 1

Explanation:

there is a relation,only if time is same

2*v1*v2/v1+v2=s

so,

2*40*60/100

4800/100

48km

Answer 2

Answer:

25 km

Explanation:

let the distance covered with 40 km/h be d₁

so d₁=40*1/4

=10km

let the distance covered with 60 km/h be d₂

so d₂=60*1/4

=15km

10+15=25km