Question

Bob travels in an airplane a distance of 2100 km. For one-third of the distance, the

airplane flies at a speed of 760 km/h, and for the rest of the distance, it flies at a speed of
800 km/h. How long does the trip take?

Answer 1

160 & 5/19ths mins is total trip. if rounding, it would be 160mins. if making decimal, roughly 160.26mins

Explanation:

1/3 of distance = 2100km/ 3

1/3 of distance = 700km

for 700km, traveled at 760km per hr.

760km per 60 mins

/760 to determine 1 km

1km per 3/38ths of a min

×700 to determine how long

first part took 55& 5/19ths mins

2/3 of distance = 2100km/3 × 2

2/3 of dis = 1400km

for 1400km, traveled at 800kmper hr

800km per 60 mins

/800 to determine mins per 1 km

1km per 3/40ths mins

×1400 to determine how long

second part took 105 mins

add 55 & 5/19ths to 105 mins

160 & 5/19ths mins is total trip. if rounding, it would be 160mins. if making decimal, roughly 160.26mins.