Question

Amen completed a trip of 136 km in 8 hours some part of the trip was covered at 15 km per hour and the remaining at 18 km per hour find the part of the trip covered at 18 metre per hour.

Answer 1

Let's say he travelled at 18km/hr for x hours and the rest 8-x at 15km/hr. Since the total distance is 136km, we must have

[math]18x + 15*(8-x) = 136[/math]
[math]x = \dfrac{16}{3}[/math]

Total distance covered at 18km/hr = [math]18\cdot\dfrac{16}{3}[/math] = 96km