RRB Group-D Model Paper 20 with answers for online practice

Given:
Distance 1 (D1) = 75 kms
Speed 1 (S1) = 15 kmph
Distance 2 (D2) = 165 kms
Speed 1 (S2) = 33 kmph
(v) Distance 3 (D3) = 120 kms
(vi) Speed 1 (S3) = 15 kmph
Concept:
By using average speed formula solve it. By using speed formula find the time for each.
Formula Used:
Average speed (S) = Total distance/Total Time
Time (T) = Distance (D)/Speed (S)
Calculation:
⇒ Average speed (S) = Total distance/Total Time
⇒ S = (D1 + D2 + D3)/(T1 + T2 + T3)
⇒ T1 = 75/15 = 5 hr
⇒ T2 = 165/33 = 5 hr
⇒ T3 = 120/15 = 8 hr
⇒ S = (75 + 165 + 120)/(5 + 5 + 8)
⇒ S = 360/18
⇒ S = 20 kmph
∴ Hence, Average speed of entire travel is 20 kmph.