P6MTC_Unit8_Lesson6_Calculating Average speed

A bus travels from Musanze to Kigali, covering a distance of 120 km in 3 hours. Then it continues from Kigali to Huye, covering 150 km in 2hours. Calculate the average speed for the whole journey.

Answer explanation

Average speed = (D1+D2) /(T1+T2)

A motorcycle travels from Nyagatare to Kayonza, covering 80 km in 4 hours. Then it travels from Kayonza to Rwamagana, covering 60 km in 3 hours. Calculate the average speed for the whole trip.

Answer explanation

Average speed = (D1+D2)/(T1+T2)

A lorry takes 4 hours to travel from town (A) to town (B) covering a distance of 180 km. It uses 2 hours to return. Calculate the average speed.

Answer explanation

Remember if he returned, D1=D2

That is why D1 =180km

and D2 also =180km

Now you can apply the formula that

Average speed =(D1+D2)/(T1+T2)

A bus takes 6 hours to cover a distance of 480 km. It returns using only 4 hours. What was its average speed?

Answer explanation

Remember if he returned, D1=D2

That is why D1 =180km

and D2 also =180km

Now you can apply the formula that

Average speed =(D1+D2)/(T1+T2)