Question

1. A motorist takes 30 mins to complete a journey when he travels at 60km/h. How long will it'

take to cover the same distance at 50 km/h?

Answer 1

36 minutes

Explanation:

Distance , speed and time:

Speed = 60 km/hr

time = 30 mins = 30/60 = 1/2 hour

`\sf \boxed{\bf Distance =speed * time}`

`\sf = 60 * (1)/(2)\\\\ = 30 \ Km`

Distance = 30 km and speed = 50 km/hr

`\sf \boxed{\bf Time =(Distance)/(speed)}`

`\sf = (30)/(50)\\\\=(3)/(5) \ hour\\\\=(3)/(5)*60\\\\= 3*12\\\\= 36 \ minutes`

Answer 2

0.6 hours

Explanation:

• First calculate the distance travelled at 60km/h:

distance = speed x time

= 60 x 0.5

= 30 km

• Now calculate the time taken at 50 km/h:

time = distance/ speed

= 30 / 50

= 0.6 hours

= 0.6 x 60 min

= 36 minutes