Delhi Chief Minister Arvind Kejriwal has approved signing of a memorandum of understanding (MoU) between the Delhi government, the Centre and the Delhi Metro Rail Corporation (DMRC) on the first three corridors being built under Phase-IV of the metro, an official statement said. These three corridors are Janakpuri West-RK Ashram Marg (28.92 km), Majlis Park-Maujpur…