An aircraft, used for fire spotting, flies from its base to locate a fire at an unknown

distance, x km away. It travels straight to the fire and back, averaging 240 km/h for the

outward trip and 320 km/h for the return trip. If the plane was away for 35 minutes, find

the distance, x km

i tried using the d = s x t formula but got it wrong

here's my working out:

d = s x t

= ((320+240)/2) x 35 = 9800 km

ANS: 80 km.

i did the same thing for this next one too, and it didn't work.

A group of hikers is to travel x km by bus at an average speed of 48 km/h to an

unknown destination. They then plan to walk back along the same route at an average

speed of 4.8 km/h and to arrive back 24 hours after setting out in the bus. If they allow

2 hours for lunch and rest, how far must the bus take them?

d = s x t

= ((48+4.

/2) x 22 = 580.8

ANS: 96 km