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