Question

After travelling 1/5 of my journey on car and 2/7 of journey by bicycle , I found that I covered 68 kms.Find the remaining distance I have to cover?

Answer 1

1/5 + 2/7=17/35

68×35=2380

2380-17/35=2363/35=67.5km

Answer 2

let I travel whole distance in journey = X km

now,
according to question ,
distance travel by car by car = X/5 km
distance travel by bicycle = 2X/7 km

so, rest distance = X - X ( 1/5 +2/7) km
= X { 1 -1/5 -2/7 } km
= X { 4/5 - 2/7 } km
= 18X/35 km

now, a/c to question given X = 68 km

then,
rest distance = 18× 68/35 km
= 34.97 ≈ 35 km