Question

53. A car travels a certain distance with 42 km h-1 for
20 minutes) and the remaining distance at 60 km


h- for 30 minutes. What is its average speed of the
whole journey?
YA
150 -
quien
Distance (km)
100-
50-
X
2 4 6
Time (in hour)​

Answer 1

Answer:

Your answer is given below-

Explanation:

42*20/60 is distance for 20 minutes=14 km

60*30/60 is distance for 30 minutes=30 kms

The remaining times average speed= means 30+14/6= the remaining speed which is 7.33 the average speed is 30+14+7=51 km p/h is your average speed.

Answer 2

Answer:

SPEED OF THE CAR =42 Km/h

Time=20 minutes=1/3 h

Distance=42×1/3=14 Km

Speed for remaining journey=60 km/h

time=30 min=1/2 h

distance=60×1/2=30 km

average speed=44/1/2+1/3=44/5/6=52.8km/h