A bus travelling at a speed of 40 kmph reaches its destination in 8 minutes and 15 seconds. How far is the destination? a. 5.43 km         b. 5.44 km        c. 5.50 km         d. 9.06 km

c. 5.50 km

Explanation:

8 min * 1h/(60 min) = 8/60 = 2/15 h

15 sec* 1 min/60 sec = 1/4 min * 1h/(60 min) =  1/240 h

8 min 15 sec = (2/15+1/240)h

40 km/h *(2/15 +1/240)h =5.50 km

no. dot product   =0 when vecs at right angles

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle