Question

a man travelled a distance of 60 km in 7 hours.he travelled partly on foot at 6 km/hr and partly on bicycle at 12 km/hr.what is the distance (in kms) travelled on foot? ​

Answer 1

let dist travelled by foot = x km

then , dist travelled by bicycle = 60 - x km

time = dist / speed

speed on foot = 6 km/h

speed on bicycle = 12 km/h

time taken on foot = x/6 hr

time taken on bicycle = 60-x/12 hr

total time taken = 7 hr

total time = time on foot + time on bicycle

7 = x/6 + (60-x)/12

7 = (2x + 60-x)/12

7 = (60 + x)/12

7*12 = 60 + x

84 = 60 + x

x = 84-60 = 14 km ...