Question

Ali drives 35 km at an average speed of 120 km/h and then 4 km at 60 km/h without stopping.

What is the average speed for the whole journey to 1 dp

Answer 1

Calculate Time from Distance and Speed Examples

Example 1:

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Speed: 50 mile per hour (km/h)

Distance: 70 miles

Time = Distance / Speed

Time = 70 km / (50 km/h)

Time = 1.4 h

1 hour = 60 minutes

0.4 h = 0.4 × 60

0.4 h = 24 minutes

Time = 1 hour 24 minutes

Time = 01:24:00 (HH:MM:SS)

Example 2:

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Speed: 40 kilometer per hour (km/h)

Distance: 60 miles

Time = Distance / Speed

Time = 60 miles / (40 km/h)

1 mile = 1.609344 km

Time = 60 × 1.609344 km / (40 km/h)

Time = 96.56064 km (40 km/h)

Time = 2.414016 h

Hours = 2 h

1 hour = 60 minutes

0.414016 h = 0.414016 × 60

0.414016 h = 24.84096 minutes

Minutes = 24 min

1 minute = 60 second

0.84096 min = 0.84096 × 60 sec

0.84096 min = 50 sec (approximately)

Seconds = 50 sec

Explanation: