a man completed a trip of 136 km in8 hours some parts are covered in 1

1.	a man completed a trip of 136 km in8 hours some parts are covered in 15 km/hr and some in 18 km/hr find the part of trip covered in 18 km/hr
Answer» Let the trip covered at 18km/hr be x = x/18. ------------------ (1) So, Part of the trip covered at 15km/hr is (136 - x) = (136 - x)/15 -------------- (2) On solving (1) and (2), we get (136 - x)/15 + x/18 = 8(Given 8 hours) (2448 - 18x + 15x)/ 15 * 18 = 8 2448 - 3x = 2160 3x = 288 x = 96km.

a man completed a trip of 136 km in8 hours some parts are covered in 15 km/hr and some in 18 km/hr find the part of trip covered in 18 km/hr

Answer»

Let the trip covered at 18km/hr be x = x/18. ------------------ (1)

So, Part of the trip covered at 15km/hr is (136 - x) = (136 - x)/15 -------------- (2)

On solving (1) and (2), we get

(136 - x)/15 + x/18 = 8(Given 8 hours)

(2448 - 18x + 15x)/ 15 * 18 = 8

2448 - 3x = 2160

3x = 288

x = 96km.